Mattermost fails to properly handle very long passwords

GHSA-m5rv-56xx-hfc6 · CVE-2026-24458 · GO-2026-4731

Published Mar 16, 2026 · Modified Mar 23, 2026

Description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to properly handle very long passwords, which allows an attacker to overload the server CPU and memory via executing login attempts with multi-megabyte passwords. Mattermost Advisory ID: MMSA-2026-00587

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-24458
WEB https://github.com/mattermost/mattermost/commit/7201f42d955f1bc44719b862132546626b60a180
PACKAGE https://github.com/mattermost/mattermost
WEB https://mattermost.com/security-updates

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