Is CVE-2025-27936 actively exploited?

CVE-2025-27936 has no public evidence of in-the-wild exploitation as of 2026-01-14.

What is the CVSS score for CVE-2025-27936?

CVE-2025-27936 has a CVSS score of 5.3 (MEDIUM severity). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.

How do I patch CVE-2025-27936?

Patch guidance is available from mattermost security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2025-27936.

CVE-2025-27936 - remediation guidance & executive summary

Q: Which products are affected by CVE-2025-27936?

2 products: mattermost mattermost server, mattermost ms teams.

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.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack Vector: network
Complexity: high
Privileges: low
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: none
Availability: none
Weaknesses: CWE-208

Metadata

Primary Vendor: MATTERMOST
Published: 4/16/2025
Last Modified: 1/14/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

mattermost : mattermost_servermattermost : ms_teams

Remediation Guidance

Executive Summary

Cite this page

CVE-2025-27936. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2025-27936

View on NIST NVD

CVE-2025-27936 vulnerability