UpHeron
All vulnerabilities

Servers and applications

CVE-2025-6226

Mattermost versions 10.5.x <= 10.5.6, 10.8.x <= 10.8.1, 10.7.x <= 10.7.3, 9.11.x <= 9.11.16 fail to verify authorization when retrieving cached posts by PendingPostID which allows an authenticated user to read posts in private channels they don't have access to via guessing the PendingPostID of recently created posts.

Severity
Medium 6.5
Published
18 Jul 2025
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
9.11.17, 10.5.7, 10.7.4, 10.8.2
Sources
NVD

Affected software

SoftwareAffected versions
MattermostServers and applications · cpe:a:mattermost:mattermost_server
  • From 9.11.0 before 9.11.17
  • From 10.5.0 before 10.5.7
  • From 10.7.0 before 10.7.4
  • From 10.8.0 before 10.8.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2025-6226
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2025-6226