UpHeron
All vulnerabilities

Servers and applications

CVE-2025-11777

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11 fail to properly validate team membership permissions in the Add Channel Member API which allows users from one team to access user metadata and channel membership information from other teams via the API endpoint

Severity
Medium 4.3
Published
13 Nov 2025
Last changed
19 Oct 2026
Added to UpHeron
1 Nov 2026
Fixed in
10.5.12, 10.11.4
Sources
NVD

Affected software

SoftwareAffected versions
MattermostServers and applications · cpe:a:mattermost:mattermost_server
  • From 10.5.0 before 10.5.12
  • From 10.11.0 before 10.11.4

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2025-11777
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2025-11777