CVE-2025-27936

Webhook Secret Exposure via Timing attack in MSteams plugin

State: Published
Severity: 5.3 Medium
Published: Apr 16, 2025
Updated: Apr 16, 2025
Reserved: Apr 8, 2025

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N	Mattermost

Weaknesses

CWE-208 Observable Timing Discrepancy

Affected Products

Product	Versions
MattermostMattermost	10.5.0 through 10.5.1Affected 10.6.0Not affected 10.5.2Not affected

References

https://mattermost.com/security-updates

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