Security Advisory

CVE-2026-4635

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-05-22 10:28:47

Last updated 2026-05-22 12:06:16

Assigner Mattermost

CVSS score 6.5

State PUBLISHED

Description

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

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