High severity7.1NVD Advisory· Published Oct 16, 2026
CVE-2026-16453
CVE-2026-16453
Description
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
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
1- Range: <=11.10.0, <=11.7.9, <=11.9.1, <=11.8.5
Patches
Vulnerability mechanics
References
1News mentions
0No linked articles in our index yet.