CVE-2026-9597

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CVSS 3.1

5.4 medium

EPSS

<1%p14

Published

Jul 13, 2026 (Jul 13, 2026)

Modified

Jul 13, 2026

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

Vendors: mattermost
Products: mattermost server
Weakness: CWE-305
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

NVD CVE.org GitHub PoCs EPSS (0.2%)

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