UpHeron
All vulnerabilities

Servers and applications

CVE-2025-9078

Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.10.x <= 10.10.1, 10.9.x <= 10.9.3 fail to properly validate cache keys for link metadata which allows authenticated users to access unauthorized posts and poison link previews via hash collision attacks on FNV-1 hashing

Severity
Medium 4.3
Published
15 Sept 2025
Last changed
19 Oct 2026
Added to UpHeron
1 Nov 2026
Fixed in
9.11.18, 10.5.9, 10.8.4, 10.9.4, 10.10.2
Sources
NVD

Affected software

SoftwareAffected versions
MattermostServers and applications · cpe:a:mattermost:mattermost_server
  • From 9.11.0 before 9.11.18
  • From 10.5.0 before 10.5.9
  • From 10.8.0 before 10.8.4
  • From 10.9.0 before 10.9.4
  • From 10.10.0 before 10.10.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2025-9078
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2025-9078