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CVE-2026-16453

7.1 high SSVC exploitation: none Undergoing Analysis
NVD · CVE.org

Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to verify the integrity of the SAML RelayState POST parameter which allows an authenticated SAML user to join any team, including invite-only teams, via forging the team_id or invite_id fields in the RelayState.. Mattermost Advisory ID: MMSA-2026-00727

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 2

  1. StatusReceived → Undergoing AnalysisNVD modified 2026-10-16 19:23
  2. First seenCVSS 7.1NVD modified 2026-10-16 08:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 1