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CVE-2026-28741GHSA-M7CF-4GH2-V4QGGO-2026-5495

CSRF Protection Bypass Allows Updating a User's Authentication Method

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 8.0.0-20260220133927-c29cf05d40f8, 11.5.0, 11.4.3, 11.3.3, 11.3.3+incompatible, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

Mattermost versions 10.11.x <= 10.11.12, 11.5.x <= 11.5.0, 11.4.x <= 11.4.2, 11.3.x <= 11.3.2 fail to validate CSRF tokens on an authentication endpoint which allows an attacker to update a user's authentication method via a CSRF attack by tricking a user into visiting a malicious page. Mattermost Advisory ID: MMSA-2026-00625

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Mattermost Mattermost

    From 10.11.0 · through 10.11.12; From 11.5.0 · through 11.5.0; From 11.4.0 · through 11.4.2; From 11.3.0 · through 11.3.2

  • github.com/mattermost/mattermost/server/v8Go

    From 8.0.0-20250721062209-4952acea88ce · fixed in 8.0.0-20260220133927-c29cf05d40f8

  • github.com/mattermost/mattermost/server/v8Go

    From 11.5.0-rc1 · fixed in 11.5.0

  • github.com/mattermost/mattermost/server/v8Go

    From 11.4.0-rc1 · fixed in 11.4.3

  • github.com/mattermost/mattermost/server/v8Go

    From 11.3.0-rc1 · fixed in 11.3.3

  • github.com/mattermost/mattermost-serverGo

    From 11.3.0-rc1+incompatible · fixed in 11.3.3+incompatible; From 11.4.0-rc1+incompatible · fixed in 11.4.3+incompatible; From 11.5.0-rc1+incompatible · fixed in 11.5.0+incompatible

  • github.com/mattermost/mattermost-server/v5Go

    All versions

  • github.com/mattermost/mattermost-server/v6Go

    All versions

References 1

mattermost.com