CVE-2025-24526: Channel export permitted on archived channel when viewing archived channels is disabled

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-02-24 · updated 2026-06-17
Weakness: CWE-863

Description

Mattermost versions 10.1.x <= 10.1.3, 10.4.x <= 10.4.1, 9.11.x <= 9.11.7, 10.3.x <= 10.3.2, 10.2.x <= 10.2.2 fail to restrict channel export of archived channels when the "Allow users to view archived channels" is disabled which allows a user to export channel contents when they shouldn't have access to it

Affected products

Mattermost: from 9.11.0 before 9.11.8; from 10.1.0 before 10.1.4; from 10.2.0 before 10.2.3; from 10.3.0 before 10.3.3; from 10.4.0 before 10.4.2 — fixed in 10.1.4, 10.2.3, 10.3.3, 10.4.2, 9.11.8

How to fix

Upgrade to a fixed version: Mattermost 10.1.4, 10.2.3, 10.3.3, 10.4.2. Check the vendor advisory for mitigations.

References

https://mattermost.com/security-updates

Get alerted when CVE-2025-24526 or the next vulnerability affects your stack