UpHeron
All vulnerabilities

Servers and applications

CVE-2025-12421

Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to to verify that the token used during the code exchange originates from the same authentication flow, which allows an authenticated user to perform account takeover via a specially crafted email address used when switching authentication methods and sending a request to the…

Severity
Critical 9.9
Published
27 Nov 2025
Last changed
19 Oct 2026
Added to UpHeron
1 Nov 2026
Fixed in
10.5.13, 10.11.5, 10.12.2, 11.0.3
Sources
NVD

Affected software

SoftwareAffected versions
MattermostServers and applications · cpe:a:mattermost:mattermost_server
  • From 10.5.0 before 10.5.13
  • From 10.11.0 before 10.11.5
  • From 10.12.0 before 10.12.2
  • From 11.0.0 before 11.0.3

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2025-12421
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2025-12421