CVE-2026-9597 — Deactivated guest accounts can authenticate via magic-link token in Mattermost REST API login endpoint
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 …
Published: 2026-07-13 · CVSS: 5.4 · CVSS 3.1
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
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7