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Mattermost CVE-2026-4635

| EUVD-2026-31431 MEDIUM
Race Condition (CWE-362)
2026-05-22 Mattermost GHSA-pg7c-462j-grxv
Denial Of Service Race Condition Mattermost
6.5
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:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
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 archive the channel before removing persistent notifications which allows authenticated user to crash the server via timing the creation of persistent notification message between the server deleting existing persistent notifications and archiving the channel.. Mattermost Advisory ID: MMSA-2026-00637

AnalysisAI

Server crash via race condition in Mattermost's persistent notification and channel archival subsystem allows any low-privileged authenticated user to bring down the server with no user interaction required. Affected branches span 10.11.x through 11.6.x across multiple maintenance lines. …

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CVE-2026-4635 vulnerability details – vuln.today
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