CVE-2026-9597

MEDIUM CVSS 5.4 View on NVD ↗

Description

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4 fail to verify whether a guest account is deactivated before creating a session in the magic-link token login path, which allows a deactivated guest user to obtain a fully functional session via a magic-link token issued prior to deactivation.. Mattermost Advisory ID: MMSA-2026-00681

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Affected Products

mattermost/mattermost_server

References

https://mattermost.com/security-updates

Published: Jul 13, 2026 09:16 UTC Modified: Jul 13, 2026 20:53 UTC