CVE-2025-27936

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.

Published: Apr 16, 2025
Updated: Jun 30, 2025
CVE: CVE-2025-27936
GHSA: GHSA-2j87-p623-8cc2
Severity: Medium
Exploit:

CVSS v3:

Severity: Unknown
Score:
AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

CWEs:

CWE-208

Affected Software
References

Software	From	Fixed in
github.com/mattermost/mattermost/server/v8	10.5.0	10.5.2
github.com/mattermost/mattermost/server/v8	-	8.0.0-20250314142426-c049748b8863
github.com/mattermost/mattermost-plugin-msteams	-	2.1.0

https://mattermost.com/security-updates
https://pkg.go.dev/vuln/GO-2025-3618

Vulnerability Database

289,784

CVE-2025-27936