Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to authenticate Atlassian Connect installed callbacks, allowing a remote unauthenticated attacker to inject a rogue sharedSecret and disrupt the Jira integration via POST to /ac/installed during the pending-install window.. Mattermost Advisory ID: MMSA-2026-00654
[POC] CVE-2026-66731 — CVE-2026-66731-Negative-Chunk-Size-Parsing-Causes-Memory-Corruption-leading-to-Server-Crash
Security Advisory: Negative Chunk-Size Parsing Causes Memory Corruption in facil.io
[POC] CVE-2026-66730 — CVE-2026-66730-Infinite-Loop-DoS-in-facil.io-MIME-Parser
Security Advisory: Infinite Loop DoS in facil.io MIME Parser (Partial Boundary)
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:H
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