Moole Vulnerability Database

Find real vulnerabilities before they ship

Medium

CVE-2026-27659

Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to properly validate CSRF tokens in the /api/v4/access_control_policies/{policy_id}/activate endpoint, which allows an attacker to trick an admin into changing access control policy active status via a crafted request.. Mattermost Advisory ID: MMSA-2026-00578

VectorNETWORK

PublishedMar 25, 2026, 17:16

Published Byresponsibledisclosure@mattermost.com

Base Score

Score4.6

Affected Versions

Package (Ecosystem)IntroducedFixedLimit

github.com/mattermost/mattermost/server/v8(Go)11.4.0-rc111.4.1N/A

github.com/mattermost/mattermost/server/v8(Go)11.3.0-rc111.3.2N/A

github.com/mattermost/mattermost/server/v8(Go)11.2.0-rc111.2.3N/A

github.com/mattermost/mattermost/server/v8(Go)10.11.0-rc110.11.11N/A

github.com/mattermost/mattermost/server/v8(Go)8.0.0-20260105080200-d27a2195068d10.11.11N/A

References

https://mattermost.com/security-updates

Weakness Type

CWE-352

CVSS Metrics

Base Score

4.6

Vector String

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Base SeverityMedium

Version

3.1

Attack Vector (AV)

NETWORK