Mattermost makes Use of Weak Hash

GHSA-9p92-x77w-9fw2 · CVE-2025-9078 · GO-2025-3959

Published Sep 15, 2025 · Modified Sep 17, 2025

Description

Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.10.x <= 10.10.1, 10.9.x <= 10.9.3 fail to properly validate cache keys for link metadata which allows authenticated users to access unauthorized posts and poison link previews via hash collision attacks on FNV-1 hashing.

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2025-9078
WEB https://github.com/mattermost/mattermost/commit/356880c8430b77a4a390c89d5a33f6928188d137
WEB https://github.com/mattermost/mattermost/commit/944ad5cdd9876ef61c78c8275906262a4118755a
WEB https://github.com/mattermost/mattermost/commit/a8a4badc130be101e5bc4b7916bbcd2f966c4b79
WEB https://github.com/mattermost/mattermost/commit/cd87e5c877373f109742aa90a3fa136c14774325
PACKAGE https://github.com/mattermost/mattermost
WEB https://mattermost.com/security-updates

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