CVE-2025-27936Medium· 5.3▾ SunlitMattermost vulnerable to Observable Timing Discrepancy
▾ Sunlit zone — Low / medium · no exploitation signal
impact 29.2 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
0.3%
0.3% → 0.3%
Mattermost Plugin MSTeams versions <2.1.0 and Mattermost Server versions 10.5.x <=10.5.1 with the MS Teams plugin enabled fail to perform constant time comparison on a MSTeams plugin webhook secret which allows an attacker to retrieve the webhook secret of the MSTeams plugin via a timing attack during webhook secret comparison.
github.com/mattermost/mattermost/server/v8 >= 10.5.0, < 10.5.2github.com/mattermost/mattermost/server/v8 < 8.0.0-20250314142426-c049748b8863github.com/mattermost/mattermost-plugin-msteams < 2.1.0Upgrade to a patched release:
github.com/mattermost/mattermost/server/v8 10.5.2github.com/mattermost/mattermost/server/v8 8.0.0-20250314142426-c049748b8863github.com/mattermost/mattermost-plugin-msteams 2.1.0Connected by shared product, vendor, weakness, or advisory.
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