CVE-2025-27936 - CVE House
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Status published Medium CVE-2025-27936

Webhook Secret Exposure via Timing attack in MSteams plugin

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Juho Forsén

References

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Affected Vendor

Affected Software

Mattermost
Vulnerable Versions:
10.5.0, 10.6.0, 10.5.2

Timeline

Official Publish: April 16th, 2025
Last Modified: April 16th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Weaknesses (CWE)

CWE-208

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.