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Vulnerabilities

Vulnerability · 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 plug

Published Apr 16, 2025 · catalog updated Apr 16, 2025 · Mattermost Mattermost

Check this week

CVE-2025-27936 is not in CISA KEV. FIRST estimates a 35.00% chance of exploitation in the next 30 days. Check whether you run Mattermost Mattermost.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
35.00%
Remediation
Advisory link
Affected products
vendor Mattermost Mattermost 10.5.0 ≤10.5.1

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Mattermost Mattermost 10.5.0 ≤10.5.110.5.0 ≤10.5.1

How to fix CVE-2025-27936

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-27936 is not in CISA KEV. FIRST estimates a 35.00% chance of exploitation in the next 30 days. Check whether you run Mattermost Mattermost.

Which versions are affected?

Compare what you have installed with Mattermost Mattermost 10.5.0 ≤10.5.1 10.5.0 ≤10.5.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 35.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 16, 2025 · EUVD

    Detected

    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.

  2. Apr 16, 2025 · EUVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2025-27936

    Official CVE identifier

    cve.org
  • EUVDVulnerability recordEUVD-2025-11359

    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

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.