## Summary Vikunja ships with `cors.origins` defaulting to `http://127.0.0.1:*` and `http://localhost:*`, and sends `Access-Control-Allow-Credentials: true`, so a page served from any port on the user's own machine may make credentialed cross-origin requests to the API and read the responses. The mandatory `service.publicurl` is appended to that default list rather than replacing it, so a fully configured production deployment still trusts every localhost origin. Combined with the token refresh endpoint, which authenticates with the `vikunja_refresh_token` cookie and returns a bearer JWT in the response body, one `fetch()` from such a page yields a working access token for whoever is logged in, and from there the whole account. ## Vulnerability Details `cors.enable` defaults to true and `cors.origins` defaults to the two localhost wildcards: https://github.com/go-vikunja/vikunja/blob/a881ac39eecd07575a5aede8e74727c28d5fd578/pkg/config/config.go#L495-L497 The middleware is registered with `AllowCredentials: true` and an `UnsafeAllowOriginFunc` that implements the port wildcard through `matchCORSOrigin`, since Echo v5 will not accept a wildcard port itself: https://github.com/go-vikunja/vikunja/blob/a881ac39eecd07575a5aede8e74727c28d5fd578/pkg/routes/routes.go#L263-L281 The detail that turns a development convenience into a production exposure is the last line of configuration handling. Enabling CORS without a public URL is a fatal error, so every deployment sets one, and that value is *appended* to the origin list rather than substituted for it: https://github.com/go-vikunja/vikunja/blob/a881ac39eecd07575a5aede8e74727c28d5fd578/pkg/config/config.go#L828-L830 An operator who configures nothing but their own hostname therefore ends up allowing three origins with credentials: their site, and any port on `localhost` and `127.0.0.1`. There is no supported configuration in which the localhost entries are quietly dropped, and nothing in the logs distinguishes the intended origin from the inherited ones. The escalation path is the refresh endpoint. It is deliberately unauthenticated because it authenticates with the refresh cookie instead of a bearer token, and it returns the new access token in the JSON body: https://github.com/go-vikunja/vikunja/blob/a881ac39eecd07575a5aede8e74727c28d5fd578/pkg/routes/api/v1/login.go#L129-L150 The cookie is `HttpOnly`, but that offers no protection here, because the attacking page never reads the cookie. It issues a credentialed request and the browser attaches the cookie itself. `SetRefreshTokenCookie` marks the cookie `SameSite=None` whenever the public URL is `https`, precisely so the cookie survives split-origin deployments, which is also what allows a cross-site send from a localhost page: https://github.com/go-vikunja/vikunja/blob/a881ac39eecd07575a5aede8e74727c28d5fd578/pkg/modules/auth/auth.go#L84-L104 So a single `fetch('https://vikunja.example.com/api/v1/user/token/refresh', {method: 'POST', credentials: 'include'})` from any page on any localhost port returns a bearer token for the logged-in user, and the CORS response headers permit the page to read it. The token carries the user's full API authority. ## Proof of Concept Three files, built together in one directory and run with: [poc.zip](https://github.com/user-attachments/files/31917334/poc.zip) ``` docker build -f Dockerfile -t poc . && docker run --rm poc ``` - `Dockerfile` builds Vikunja from commit `a881ac39eecd07575a5aede8e74727c28d5fd578` and bakes the reproducer in. - `poc.sh` is the entrypoint. It starts the application on sqlite with `service.publicurl` as the only setting configured, waits for the health check, and runs the exploit. - `exploit.py` registers a user, logs them in, then acts as a page on `http://localhost:31337`: it reads the refresh cookie attributes, sends the CORS preflight, makes the credentialed refresh request, and asks the API who the returned token belongs to. Nothing is stubbed and no internal function is called; everything after startup is ordinary HTTP against the running application. In the output `[+]` lines are measured checks and `[*]` lines are commentary, so only the checks and the final verdict are evidence. A run against `a881ac39eecd07575a5aede8e74727c28d5fd578` prints: ``` [*] Vikunja built from commit a881ac39ee, sqlite, service.publicurl=https://vikunja.example.com. [*] service.publicurl is the only setting configured. cors.enable and cors.origins keep their defaults. [+] The victim logs in and the refresh cookie is issued SameSite=None; Secure, so it is sent cross-site. [+] A page on http://localhost:31337 is allowed to send credentials: Access-Control-Allow-Origin: http://localhost:31337, Access-Control-Allow-Credentials: true [+] That page reads the response of a credentialed refresh, which carries a bearer token: eyJhbGciOiJIUzI1NiIsInR5cCI6... [+] The token authenticates as: 'victim' EXPLOIT SUCCESSFUL ``` ## Suggested Fix The fix is for `service.publicurl` to replace the localhost defaults rather than extend them, so that configuring a deployment narrows the allowed origins instead of widening them. If the localhost entries are retained deliberately for desktop clients, they should not be combined with `AllowCredentials: true`, since it is the combination that allows a third-party origin to read authenticated responses. ## Attribution This vulnerability was found using Google's security automation tooling, abd triaged manually with manual report writing by Ada Logics. Please credit Google and Ada Logics in any advisories.
PoC: node2shell-scanner
High fidelity detection mechanism for node2shell (CVE-2026-111497)
PoC: http2shell-CVE-2026-111497
PoC for CVE-2026-111497, a buffer overflow in Google Brotli 1.0.3–1.2.0 that may cause memory corruption, data disclosure, DoS, or RCE when processing crafted compressed data.
PoC: CVE-2026-111497-Toolkit
CVE-2026-111497 – Node.js Brotli Decoder OOB Write (CVSS 9.2) | Red/Blue Team suite for unpatched Node.js 22.x, 24.x, 26.x. 2 tools: Full Exploit (patch detection, remote DoS, Brotli bomb, lab RCE), Blue Team Checker (errno differential, version fingerprint, WAF detection, reporting) Only Use Ethically Only <3
PoC: runcloud-php2shell-patch
Build script for PHP (7.2 - 8.1) binaries mitigating PHP2Shell (CVE-2026-109618, CVE-2026-109619) on RunCloud Ubuntu servers.
PoC: php2shell-scan
A deliberately limited, read-only security scanner for assessing exposure to CVE-2026-109618 (RFC 1867 multipart OOM memory corruption) and CVE-2026-109619 (stale global state use-after-free) in PHP deployments.
PoC: CVE-2026-111497
Non-invasive Python detector for CVE-2026-111497 with Brotli/Node.js version checks, JSON inventories, and CI-ready reports.
PoC: AI-Threat-Detection-PHP-CGI-Vulnerabilities
A curated, deep-dive guide to leveraging Artificial Intelligence, Machine Learning, and Large Language Models (LLMs) to detect, analyze, and neutralize advanced web application threats—with a specific focus on recent, critical PHP CGI Argument Injection vulnerabilities (such as CVE-2024-4577) and similar Remote Code Execution (RCE) breaches.
PoC: php2shell-doctor
The safe checker for the php2shell PHP RCEs (CVE-2026-109618/109619). Local, offline, vendor-backport aware.
PoC: node2shell-lab
Node2Shell (CVE-2026-111497, Node.js Brotli decoder OOB write) black-box pentest lab — crash-gated double flag, agent-calibrated. Part of the *2Shell lab series. EN/中文/日本語.
PoC: php2shell-ioc
Curated IoCs, detection engineering rules, and automated threat intel feeds for PHP2Shell (CVE-2026-109618 & CVE-2026-109619).
PoC: php2shell-toolkit
CVE-2026-109618 PHP session.upload_progress detection & authorized testing toolkit
PoC: HTTP2Shell-PoC
PoC for CVE-2026-111497 (HTTP2Shell)
PoC: cve-2024-10441-synology-rce
Writeup y PoC educativo de CVE-2024-10441 (RCE pre-auth como root en Synology DSM via synoplugind). CVE ya parcheado; uso autorizado/defensivo.
PoC: php2shell-migration
Agent Skills skill to detect, patch and verify PHP apps affected by PHP2Shell (CVE-2026-109618, CVE-2026-109619) or outdated PHP. Works with Claude Code, Codex, Copilot, Cursor, Gemini CLI, OpenCode.
PoC: php2shell
CVE-2026-109618 exploit tool — RCE via OOM ghost bucket in PHP POST parsing (CVSS 9.2)
PoC: CVE-2026-114509
Python detector for Laravel TokenGuard CVE-2026-114509 with local dependency analysis, remote authentication checks, and JSON reporting.
PoC: CVE-2026-110264
Non-invasive Python detector for CVE-2026-110264 in GitLab, featuring version checks, offline log analysis, and JSON reporting.
PoC: CVE-2026-0073
CVE-2026-0073: Android adbd TLS auth bypass PoC. Exploits a logic bug where OpenSSL's EVP_PKEY_cmp() returns -1 on key type mismatch (EC vs RSA), incorrectly evaluating to true and granting access. Includes functional Python and standalone C exploits to gain unauthenticated remote shell on Android devices with Wireless Debugging enabled.
PoC: CVE-2025-26326
CVE-2025-26326 - vulnerabilidade critica em add-ons de conexao remota do NVDA (recuperado)
PoC: CVE-2024-6387-how-to-fix
Guia de correcao e mitigacao da CVE-2024-6387 (regreSSHion / OpenSSH) (recuperado)
PoC: Cloudflare-Exploits-CVE-2026-14440-CVE-2026-3125-CVE-2025-0651
PoC e exploits para CVE-2026-14440 (Universal SSL CAA Bypass), CVE-2026-3125 (OpenNext SSRF), CVE-2025-0651 (WARP Windows Privesc) | By Gh0st-Bx1
PoC: Bigfix-PHP-Vulnerability-Scanner-Content-CVE-2026-109618-CVE-2026-109619
Bigfix PHP Vulnerability Scanner Content (CVE-2026-109618, CVE-2026-109619) for Windows, Linux and Mac.
PoC: PHP2Shell
A local Docker-based research lab for investigating PHP2Shell (CVE-2026-109618 and CVE-2026-109619), comparing PHP 8.4.26 and 8.4.27, and validating upstream security fixes and regression tests.
PoC: Galaxy-Tab-S10FE-Root
One-command ADB root for Samsung Galaxy Tab S10 FE (SM-X520, X520XXSACZH6): CVE-2026-43499 GhostLock exploit + KernelSU late-load. No bootloader unlock.
PoC: Fortinet-Exploits-CVE-2026-39808-106173-107656
PoC e Exploits completos para CVE-2026-39808 (FortiSandbox RCE), CVE-2026-106173 (FortiSIEM gRPC Path Traversal RCE) e CVE-2026-107656 (FortiSandbox Auth Bypass) - CVSS 9.6-9.8
PoC: bug-free-broccoli
CVE-2026-59248
PoC: php2shell-checker
Check PHP for PHP2Shell (CVE-2026-109618, CVE-2026-109619): fixed PHP and Ubuntu/Debian/AlmaLinux packages, plus a read-only version check script.
PoC: http2shell-checker
Check Node.js, Bun, Python Brotli and libbrotli for HTTP2Shell / Node2Shell (CVE-2026-111497): fixed versions and a read-only version check script.
PoC: CVE-2026-109618-109619-checker
CVE-2026-109618 / 109619 checker
PoC: CVE-2026-106781
CVE-2026-106781 CH341SER Driver Installer Privilege Escalation
PoC: CVE-2026-112900-PoC
Proof of Concept (PoC) demonstrating Argument Injection in Pillow's Ghostscript call (Pillow < 13.0.0) potentially leading to arbitrary command execution (RCE).
PoC: Root-My-Galaxy-S4
Root the Samsung Galaxy S4 on official firmware via CVE-2015-1805 & KNOX e-fuse stays intact
PoC: ksu-root
在 REDMI K90 Max（代号 prague / OS4.0.0.14）上，从手机端一键开一个临时 root。利用 CVE-2026-64560（posix-cpu-timers UAF）加载 KernelSU LKM，重启即失效。不需要电脑、不刷机、不解锁 Bootloader。
PoC: CVE-2026-115560
PHP session.upload_progress Enabled - CVE-2026-115560 Precondition
PoC: php2shell
php2shell(CVE-2026-109618 / CVE-2026-109619) EXP
PoC: cve-2026-98260-vivo-gki-research
Research notes: porting CVE-2026-98260 to vivo/iQOO GKI 6.6.127 (no exploit code; coordinated disclosure planned)
PoC: brotli-cve-check
Agent skill + script to scan projects for CVE-2026-111497 (Brotli), rate criticality and suggest fixes
PoC: php2shellX
Next-generation exploit orchestrator for CVE-2026-109618/619 — adds Cloudflare WAF bypass, flexible target specification (URL/host/port/path/batch), multi-format output (JSON/CSV/table), resume capability, and lab automation (Docker restart). Authored by TESTERXMA.
PoC: a12-ghostlock
One-click root for the Samsung Galaxy A12 (SM-A125F) via CVE-2026-43499 (GhostLock) - KernelSU-compatible userspace stack, grant dialog, verified root in Neo Backup / App Manager / Shizuku
PoC: o3root
Shizuku-driven CVE-2026-98260 root + KernelSU runtime LKM loader for Xiaomi yingtian / lhasa (kernel 6.18.21)
PoC: homebrew-php2shell-doctor
Homebrew tap for php2shell-doctor - the safe checker for the php2shell PHP RCEs (CVE-2026-109618/109619)
PoC: php-fpm-docker-PHP-7.4-CVE-2026-109618-109619-free
php:7.4-fpm-CVE-2026-109618-109619-free
PoC: cve-2026-25262-poc
CVE-2026-25262 (Qualcomm BootROM) deep-dive on the Black Hat Asia 2026 'A journey through Sahara' talk + read-only Sahara/EDL recon harness. GPLv3.
PoC: CVE-2026-74580
CVE-2026-74580 vhost: reset the vring metadata cache on vring reconfiguration - Exploit
PoC: log4shell-audit-4
Quarterly security briefing research notes and remediation tracking for Log4Shell (CVE-2021-44228).
PoC: CEV-2020-25213_wp-file-manger_exploit
CVE-2020-25213 - Unauthenticated RCE exploit for WP File Manager plugin (≤ 6.0) | Educational purposes only
PoC: php-vulns-discovered-23-10-2026
Patch temporanee per sistemi con versioni di PHP inferiori a 8.2.35 contro CVE-2026-109618 - CVE-2026-109619 - CVE-2026-115560
PoC: CVE-2026-109618-php56-public
Exact-build PHP 5.6 research and reproducible labs for CVE-2026-109618 and CVE-2026-109619
PoC: Compiled-CVE-2023-21752
Compiled version of Wh04m1001's exploit for iwr/wget delivery to VM.
PoC: CVE-2026-83548
CVE-2026-83548 — SonicWall SMA1000 Work Place pre-auth SSRF
PoC: CVE-2026-64849
CVE-2026-64849 — MLflow SSRF
PoC: CVE-2026-21627
CVE-2026-21627 proof of concept and exploit script
PoC: php8.1-cve-109618-109619-fix
php:8.1.34-fpm-alpine + official PHP patch for CVE-2026-109618/109619
PoC: php7.4-cve-109618-109619-fix
php:7.4.33-fpm-alpine + official PHP patch for CVE-2026-109618/109619
PoC: php2shell
Exploit & analysis for PHP2Shell (CVE-2026-109618 / CVE-2026-109619). Demonstrating memory disclosure, ASLR bypass, and RCE via session.upload_progress memory bailout dangling pointers.
PoC: php2shell-demo
🛡️ Hands-on defensive Docker lab for the October 2026 RCE week — PHP2Shell (CVE-2026-109618/619), Node.js Brotli & Next.js sharp. See the attack surface and blast radius, and learn to shut them down. No exploits.
PoC: CVE-2026-115560
CVE-2026-115560: PHP session upload-progress serialize_handler mismatch → pre-auth object injection → RCE. Check/exploit/verify scripts + Docker lab + Suricata/Sigma detection rules.
PoC: CVE-2026-86426
CVE-2026-86426 CHECK
PoC: php-radar
Detection-only exposure scanner for PHP2Shell (CVE-2026-109618/109619): finds PHP across repositories, hosts, a network perimeter, and AWS, and grades each install by version and config without triggering the bug.
PoC: spip-cve-2026
PoC for CVE-2026-72708 (blind SQLi) and CVE-2026-109378 (SSRF) in SPIP, both fixed in 4.4.18
PoC: php2shell
PHP2Shell: finding and patching affected PHP CVE-2026-109618 and CVE-2026-109619
PoC: php2shell-audit
Exposure scanner, patch verifier and threat hunter for CVE-2026-109618/9, with a cyberpunk TUI.
PoC: DFRoot
Fork of datfooldive/DFRoot (DirtyFrag CVE-2026-43284, ReSukiSU) + GitHub Actions APK build
PoC: php8-cve-109618-109619-fix
php:8.0.30-fpm-alpine + official PHP patch for CVE-2026-109618/109619
PoC: brotli-secfix
Security backport toolkit for CVE-2026-111497 on Ubuntu 24.04, featuring upstream patch verification, custom Debian package builds, and offline remediation procedures.
PoC: CVE-2026-88009-PoC
CVE-2026-88009 — Traefik forwards a rootless opaque request target that routing/forwardAuth see as '/'. Auth bypass + access-log evasion, verified v3.7.10 / v3.7.13.
PoC: CVE-2026-85595-PoC
CVE-2026-85595 — Traefik digestAuth authentication bypass (unknown username => empty HA1). Lab-verified: v3.7.10 bypass, v3.7.11 401.
PoC: CVE-2026-85168-PoC
CVE-2026-85168 — n8n Git node RCE from repo-local filter.*.clean / merge-driver config on add|commit|checkout. Verified v2.35.3 / v2.36.2.
PoC: CVE-2026-86076-PoC
CVE-2026-86076 — n8n expression sandbox escape via class-field __sanitize rebinding (backend RCE). Verified v2.37.6 (uid=node) / v2.37.7.
PoC: CVE-2026-109618-CVE-2026-109619-php2shell-
MOSTAFA JR7 - Custom security research framework targeting PHP 8.4.26 Apache Prefork RCE and ASLR bypass.
PoC: CVE-2026-111497-node2shell
CVE-2026-111497 Node2Shell — Node.js Brotli OOB Write RCE PoC (CVSS 9.2)
PoC: CVE-2026-56190-Windows-Server-2022-RDP
Unauthenticated RDP vulnerability in termsrv.dll (Windows Server 2022). Proof of Concept for heap spray, XFG bypass, Instruction Pointer control, and reliable Denial of Service (Event ID 7031).
PoC: cve-2026-111497-rce-checker
Lab-only exact-profile RCE/DoS validator for CVE-2026-111497; refuses non-loopback targets
PoC: php2shell-probe
Standalone detection probe for PHP2Shell (CVE-2026-109618 / CVE-2026-109619): passive version fingerprint by default, opt-in active crash probe via Nuclei.
PoC: portainer-cve-2026-44848-checker
Non-destructive checker for CVE-2026-44848: Portainer missing authorization on Docker plugin endpoints
PoC: php2shell
Check and patch all installed PHP versions against PHP2Shell (CVE-2026-109618, CVE-2026-109619) on Debian/Ubuntu with PHP from Surý (HestiaCP supported)
PoC: CVE-2026-38526-Exploit
my version of an exploit for Krayin CRM v2.2.x - CVE-2026-38526
PoC: cve-2026-114820-java-scan
Read-only Ansible playbook that finds Java truststores still anchoring the eMudhra and AAA roots removed for CVE-2026-114820.
PoC: php-5.4-cve-2026-php2shell-patch
Patch for old php 5.4.23 version from CVE-2026-109618 и CVE-2026-109619 vulnerabilities
PoC: CVE-2026-116012
NSA Ghidra contains a numeric truncation vulnerability in PackedDecode::skipAttribute and skipAttributeRemaining in marshal.cc.
PoC: CVE-2026-116011
A remote denial of service vulnerability in CrowCPP due to uncontrolled recursion.
PoC: project2026_20261024_php2shellcheck
One-file PHP check for the PHP2Shell fixes (CVE-2026-109618, CVE-2026-109619). No exploit, no network.
PoC: CVE-2026-109618-POC
A PHP app that ships an unpatched PHP runtime (PHP2Shell), for the Devzy scan to flag. No exploit code.
PoC: rootkit
越狱助手 · RootKit for Honor Magic9 (CVE-2026-64560 → cred 写 → 自制内核模块 → KernelSU)，Flutter + Shizuku 一键 root
PoC: php2shell-scan-revamp
A clean, modular, and extensively documented reimplementation of the Assetnote php2shell scanner for detecting CVE-2026-109618 and CVE-2026-109619 in PHP environments.
PoC: php2shell-detection-engineering-lab
Production-grade detection engineering suite (Sigma rules & Wazuh XML) and DFIR triage scripts for CVE-2026-109618 / CVE-2026-109619 (PHP2Shell).
PoC: CVE-2026-98260-BRM-AN00
CVE-2026-98260 temporary root for HONOR Win2 BRM-AN00, handed to BakaSU. No flashing.
PoC: patchferry-check
Free read-only scripts to check servers for PHP2Shell (CVE-2026-109618 / CVE-2026-109619) and PHP end-of-life versions
PoC: php2shell-php
Detect php2shell (CVE-2026-109618 / CVE-2026-109619) on remote PHP targets — behavioral multipart probes, version fallback, async CLI in PHP.
PoC: php2shell-el7-el8-rpm-fixed
Unofficial patched PHP RPMs for EL7/EL8 mitigating php2shell (CVE-2026-109618, CVE-2026-109619), including legacy Remi SCL and AppStream builds.
PoC: cve-2026-110152-chrome-ngle-rce-poc
PoC: CVE-2026-110152 Chrome ANGLE vertex-attribute translation heap buffer overflow (CVSS 9.6)
PoC: CVE-2025-5548
Proyecto de explotación.
PoC: cve-2026-109618-php2shell-poc
CVE-2026-109618 (php2shell part 1): local deterministic memory-safety PoC
PoC: php2shel
This repository contains operational information regarding the critical PHP vulnerabilities tracked by CERT-EU as CVE-2026-109618 and CVE-2026-109619. PHP is a widely used open-source server-side scripting language, so these vulnerabilities may affect a broad range of internet-facing web applications and products that embed or depend on PHP.
PoC: docker-php74-trixie
Docker Image php:7.4-fpm with security fixes for CVE-2026-109618 and CVE-2026-109619 updated to build and run on Debian Trixie
PoC: CVE-2024-45490-libexpat-poc
PoC + Docker test harness for CVE-2024-45490 (libexpat XML_ParseBuffer negative length integer handling issue)
PoC: log4shell-audit-3
Log4Shell (CVE-2021-44228) remediation tracking for the quarterly security briefing
PoC: RHYTHM-SINGH
High fidelity scanner for php2shell (CVE-2026-109618 and CVE-2026-109619)
PoC: php2shell-detection
Detection and response package for php2shell (CVE-2026-109618 / CVE-2026-109619): Suricata, Zeek, YARA, Sigma, ModSecurity rules, hunting queries, SOC triage, patch matrix. No exploit code.
PoC: el7-php71-security
Patched PHP 7.1 RPMs for CentOS 7 (Remi php-* and php71-php-*) fixing CVE-2026-109618 / CVE-2026-109619, with an installer that detects the server's PHP, upgrades it and can roll back.
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