CVE-2025-1792: Improper Access Control in Mattermost Channel Member API

Severity: low (CVSS 3.1 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: 2025-05-30 · updated 2026-06-17
Weakness: CWE-863

Description

Mattermost versions 10.7.x <= 10.7.0, 10.5.x <= 10.5.3, 9.11.x <= 9.11.12 fail to properly enforce access controls for guest users accessing channel member information, allowing authenticated guest users to view metadata about members of public channels via the channel members API endpoint.

Affected products

Mattermost: from 9.11.0 before 9.11.13; from 10.5.0 before 10.5.4; from 10.7.0 before 10.7.1 — fixed in 10.5.4, 10.7.1, 9.11.13

How to fix

Upgrade to a fixed version: Mattermost 10.5.4, 10.7.1, 9.11.13. Check the vendor advisory for mitigations.

References

https://mattermost.com/security-updates

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