CVE-2025-27936 — MEDIUM (5.3)

Q: How severe is CVE-2025-27936?

CVE-2025-27936 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2025-27936?

Check the references section above for vendor advisories and patch information. Affected products include: Mattermost Mattermost Server, Mattermost Ms Teams.

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.

CVSS Score

5.3

MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

NONE

Availability

NONE

Affected Products

Vendor	Product	Versions
Mattermost	Mattermost Server	< 10.5.2
Mattermost	Ms Teams	< 2.1.0

Related Weaknesses (CWE)

CWE-208

References

https://mattermost.com/security-updatesVendor Advisory

FAQ

What is CVE-2025-27936?

CVE-2025-27936 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 wh...

How severe is CVE-2025-27936?

CVE-2025-27936 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2025-27936?

Check the references section above for vendor advisories and patch information. Affected products include: Mattermost Mattermost Server, Mattermost Ms Teams.