UpHeron
All vulnerabilities

Servers and applications

CVE-2025-55073

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to validate the relationship between the post being updated and the MSTeams plugin OAuth flow which allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL.

Severity
Medium 5.3
Published
14 Nov 2025
Last changed
19 Oct 2026
Added to UpHeron
1 Nov 2026
Fixed in
10.5.12, 10.11.4, 10.12.1
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
  • From 10.12.0 before 10.12.1

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2025-55073
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2025-55073