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Mattermost EUVD-2026-30740

| CVE-2026-4273 LOW
Incorrect Authorization (CWE-863)
2026-05-18 Mattermost GHSA-hqpj-f3jh-29vx
Authentication Bypass Mattermost
3.7
CVSS 3.1

CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

Lifecycle Timeline

1
Analysis Generated
May 18, 2026 - 08:15 vuln.today

DescriptionNVD

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to validate that the RefreshedToken differs from the original invite token during remote cluster invite confirmation which allows an authenticated attacker to bypass token rotation and reuse the original invite token via sending a crafted invite confirmation with a RefreshedToken matching the original token. Mattermost Advisory ID: MMSA-2026-00575

AnalysisAI

Authenticated attackers can bypass token rotation in Mattermost's remote cluster invite confirmation process by reusing original invite tokens. The flaw affects Mattermost Server versions 11.5.x through 11.5.1 and 10.11.x through 10.11.13, allowing token reuse despite intended security controls. …

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EUVD-2026-30740 vulnerability details – vuln.today
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