CVE-2025-3913: Team Privacy Settings Authorization Bypass in Mattermost Server

Severity: low (CVSS 3.8 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: 2025-05-29 · updated 2026-06-17
Weakness: CWE-863

Description

Mattermost versions 10.7.x <= 10.7.0, 10.6.x <= 10.6.2, 10.5.x <= 10.5.3, 9.11.x <= 9.11.12 fail to properly validate permissions when changing team privacy settings, allowing team administrators without the 'invite user' permission to access and modify team invite IDs via the /api/v4/teams/:teamId/privacy endpoint.

Affected products

Mattermost: from 9.11.0 before 9.11.13; from 10.5.0 before 10.5.4; from 10.6.0 before 10.6.3; from 10.7.0 before 10.7.1 — fixed in 10.5.4, 10.6.3, 10.7.1, 9.11.13

How to fix

Upgrade to a fixed version: Mattermost 10.5.4, 10.6.3, 10.7.1, 9.11.13. Check the vendor advisory for mitigations.

References

https://mattermost.com/security-updates

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