CVE-2026-2462

Medium

Description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to restrict plugin installation on CI test instances with default admin credentials which allows an unauthenticated attacker to achieve remote code execution and exfiltrate sensitive configuration data including AWS and SMTP credentials via uploading a malicious plugin after changing the import directory. Mattermost Advisory ID: MMSA-2025-00528

SeverityMedium

CVSS6.6

Exploit probability—

Product

Mattermost Server

PublishedMar 16, 2026

First seenMar 16, 2026

Weakness typeCWE-863Incorrect authorization

How to fix

Update

mattermost mattermost_server10.11.11, 11.2.3, 11.3.1 or later

Vendor advisories

mattermost.com/security-updates

Affected products

Product	Affected versions	Fixed in
mattermost mattermost_server	10.11.0 ≤ v < 10.11.11, 11.2.0 ≤ v < 11.2.3, 11.3.0 ≤ v < 11.3.1	10.11.11, 11.2.3, 11.3.1

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