CVE-2025-27936

Mattermost Plugin MSTeams versions <2.1.0 and Mattermost Serverversions 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 allowsan attacker to retrieve the webhook secret of the MSTeams plugin via a timing attack during webhook secret comparison.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
5.3 MEDIUM
NETWORK
HIGH
LOW
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
MattermostCNA
5.3 MEDIUM
NETWORK
HIGH
LOW
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
CISA-ADPADP
---
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Base Score
CVSS 3.x
EPSS Score
Percentile: 21%
VendorProductVersion
mattermostmattermost_server
𝑥
< 10.5.2
mattermostms_teams
𝑥
< 2.1.0
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://mattermost.com/security-updates