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Mattermost EUVD-2026-31430

| CVE-2026-4646 MEDIUM
Improper Validation of Specified Type of Input (CWE-1287)
2026-05-22 Mattermost GHSA-rmvv-8v8w-rf7x
Denial Of Service Mattermost
4.3
CVSS 3.1
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CVSS VectorNVD

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

Lifecycle Timeline

1
Analysis Generated
May 22, 2026 - 11:32 vuln.today

DescriptionNVD

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to validate user-supplied input in API request handlers which allows an authenticated attacker to crash the plugin process via a crafted HTTP request to the PR details endpoint.. Mattermost Advisory ID: MMSA-2026-00638

AnalysisAI

Authenticated denial-of-service in Mattermost's plugin subsystem allows a low-privileged user to crash the plugin process by sending a crafted HTTP request to the PR details API endpoint. Affected across four active release branches (10.11.x, 11.4.x, 11.5.x, 11.6.x), the flaw stems from missing input validation in API request handlers (CWE-1287). …

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EUVD-2026-31430 vulnerability details – vuln.today
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