CVE-2026-3109

Low

Description

Mattermost Plugins versions <=11.4 10.11.11.0 fail to validate webhook request timestamps which allows an attacker to corrupt Zoom meeting state in Mattermost via replayed webhook requests. Mattermost Advisory ID: MMSA-2026-00584

SeverityLow

CVSS2.2

Exploit probability—

Product

Mattermost Server

PublishedMar 26, 2026

First seenMar 26, 2026

Weakness typeCWE-754CWE-754

How to fix

Update

mattermost mattermost_server10.11.12 or later

Vendor advisories

mattermost.com/security-updates

Affected products

Product	Affected versions	Fixed in
mattermost mattermost_server	10.11.0 ≤ v < 10.11.12	10.11.12

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