CVE-2026-5308HIGHCVSS 7.5

Mattermost doesn't enforce request body size limits on plugin HTTP endpoints

Published May 26, 2026·Updated Jun 29, 2026

Description

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to enforce request body size limits on plugin HTTP endpoints which allows an attacker to cause a denial of service via crafted oversized HTTP requests.. Mattermost Advisory ID: MMSA-2026-00646

Affected Packages (2)

github.com/mattermost/mattermost-plugin-githubGO
Fixed in 1.0.1-0.20260410143745-9b41b1fd43c4
github.com/mattermost/mattermost-serverGO
Fixed in 11.6.1

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

View on NVD Search GitHub Search Google

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