GCVE-VVD-NCSC-2025-378

Advisory PublishedCVSS 9.9/10

Vulnetix · Advisory published November 28, 2025

Mattermost versions 11.0.x up to 11.0.2, 10.12.x up to 10.12.1, 10.11.x up to 10.11.4, and 10.5.x up to 10.5.12 are vulnerable to account takeover via a crafted email address during authentication.

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Weaknesses (CWE)

CWE-303Incorrect Implementation of Authentication Algorithm

Risk Scores

CVSS 3.1

9.9/10

Critical · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected Products

Vendor	Product	Versions	Platforms
Mattermost	vers:unknown/*	—	—

Aliases

CVE-2025-12421 CVE-2025-12419

Transitive aliases

EUVD-2025-199833 GO-2025-4168 GHSA-3x39-62h4-f8j6 BDU:2025-15205 BDU:2025-15264 VVD-CISA-2025-12421 EUVD-2025-199827 VVD-CISA-2025-12419 GO-2025-4170 GHSA-mp6x-97xj-9x62

References

advisory

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