CVE-2026-3590

MediumCVSS 6.5/10Last modified Jun 17, 2026

Description

Mattermost versions 10.11.x <= 10.11.12, 11.5.x <= 11.5.0, 11.4.x <= 11.4.2, 11.3.x <= 11.3.2 fail to enforce atomic single-use consumption of guest magic link tokens, which allows an attacker with access to a valid magic link to establish multiple independent authenticated sessions via concurrent requests.. Mattermost Advisory ID: MMSA-2026-00624

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Weakness enumeration

CWE-367

Affected software

Vendor	Product	Versions
Mattermost	Mattermost	>= 10.11.0, <= 10.11.12; >= 11.5.0, <= 11.5.0; >= 11.4.0, <= 11.4.2; >= 11.3.0, <= 11.3.2

References

https://mattermost.com/security-updatesVendor Advisory

Timeline

Published: Apr 15, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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