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CVE-2026-3590

Race Condition in Guest Magic Link Authentication Allows Token Reuse PUBLISHED

Description (CNA)

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

Affected (CNA)

Vendor / productVersions
Mattermost / Mattermostaffected 10.11.0 through 10.11.12; affected 11.5.0 through 11.5.0; affected 11.4.0 through 11.4.2; affected 11.3.0 through 11.3.2; unaffected 11.6.0; unaffected 10.11.13; unaffected 11.5.1; unaffected 11.4.3; unaffected 11.3.3

CWE

CWE-367

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.