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Mattermost EUVD-2026-31425

| CVE-2026-5308 MEDIUM
Uncontrolled Resource Consumption (CWE-400)
2026-05-22 Mattermost GHSA-jmvr-r5hm-fxfr
Denial Of Service Mattermost
4.9
CVSS 3.1
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CVSS VectorNVD

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

Lifecycle Timeline

1
Analysis Generated
May 22, 2026 - 11:31 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 enforce request body size limits on plugin HTTP endpoints which allows an attacker to cause a denial of service via crafted oversized HTTP requests.. Mattermost Advisory ID: MMSA-2026-00646

AnalysisAI

Denial of service in Mattermost's plugin HTTP endpoint layer allows an authenticated high-privilege attacker to exhaust server resources by sending crafted oversized HTTP request bodies. Affected across four concurrent release branches - 10.11.x through 11.6.x - with no published EPSS score and no confirmed active exploitation or public proof-of-concept at time of analysis. …

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EUVD-2026-31425 vulnerability details – vuln.today
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