CVE-2025-27936: GO-2025-3618 - Mattermost vulnerable to Observable Timing Discrepancy in github.com/mattermost/mattermost-plugin-msteams

CVE-2025-27936 · Severity: low · CVSS 3.1 · Published 2025-04-22

Mattermost vulnerable to Observable Timing Discrepancy in github.com/mattermost/mattermost-plugin-msteams

Technologies: github.com/mattermost/mattermost-plugin-msteams (Go), github.com/mattermost/mattermost-server (Go), github.com/mattermost/mattermost-server/v5 (Go), github.com/mattermost/mattermost-server/v6 (Go), github.com/mattermost/mattermost/server/v8 (Go). Vendors: Go.

Quick answers

Is CVE-2025-27936 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-27936 being exploited in the wild.
How severe is CVE-2025-27936?
Low severity, with a CVSS score of 3.1, published 22 April 2025.
Which products and versions are affected?
github.com/mattermost/mattermost-plugin-msteams (Go) SEMVER:introduced=0, SEMVER:introduced=0,fixed=2.1.0; github.com/mattermost/mattermost-server (Go) SEMVER:introduced=10.5.0+incompatible,fixed=10.5.2+incompatible; github.com/mattermost/mattermost-server/v5 (Go) SEMVER:introduced=0; github.com/mattermost/mattermost-server/v6 (Go) SEMVER:introduced=0; and 1 more.
Is there a fix for CVE-2025-27936?
Yes. github.com/mattermost/mattermost-plugin-msteams (Go): upgrade to 2.1.0 or later; github.com/mattermost/mattermost-server (Go): upgrade to 10.5.2+incompatible or later; github.com/mattermost/mattermost/server/v8 (Go): upgrade to 10.5.2, 8.0.0-20250218121836-2b5275d87136 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-27936?
Check whether you run github.com/mattermost/mattermost-plugin-msteams (Go), github.com/mattermost/mattermost-server (Go), github.com/mattermost/mattermost-server/v5 (Go) or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/mattermost/mattermost-plugin-msteams (Go): upgrade to 2.1.0 or later
    go get github.com/mattermost/mattermost-plugin-msteams@v2.1.0
  • github.com/mattermost/mattermost-server (Go): upgrade to 10.5.2+incompatible or later
    go get github.com/mattermost/mattermost-server@v10.5.2+incompatible
  • github.com/mattermost/mattermost/server/v8 (Go): upgrade to 10.5.2, 8.0.0-20250218121836-2b5275d87136 or later
    go get github.com/mattermost/mattermost/server/v8@v10.5.2

Affected products

  • github.com/mattermost/mattermost-plugin-msteams (Go) SEMVER:introduced=0, SEMVER:introduced=0,fixed=2.1.0
  • github.com/mattermost/mattermost-server (Go) SEMVER:introduced=10.5.0+incompatible,fixed=10.5.2+incompatible
  • github.com/mattermost/mattermost-server/v5 (Go) SEMVER:introduced=0
  • github.com/mattermost/mattermost-server/v6 (Go) SEMVER:introduced=0
  • github.com/mattermost/mattermost/server/v8 (Go) SEMVER:introduced=0,fixed=8.0.0-20250218121836-2b5275d87136, SEMVER:introduced=10.5.0,fixed=10.5.2

Identifiers

  • CVE-2025-27936
  • GHSA-2j87-p623-8cc2
  • GO-2025-3618

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