CVE-2025-25274: Unauthorized Command Execution in Archived Channels

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-03-21 · updated 2026-06-17
Weakness: CWE-863

Description

Mattermost versions 10.4.x <= 10.4.2, 10.3.x <= 10.3.3, 9.11.x <= 9.11.8 fail to restrict command execution in archived channels, which allows authenticated users to run commands in archived channels.

Affected products

Mattermost: from 9.11.0 before 9.11.9; from 10.3.0 before 10.3.4; from 10.4.0 before 10.4.3 — fixed in 10.3.4, 10.4.3, 9.11.9

How to fix

Upgrade to a fixed version: Mattermost 10.3.4, 10.4.3, 9.11.9. Check the vendor advisory for mitigations.

References

https://mattermost.com/security-updates

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