CVE-2026-27659
CSRF vulnerability in UpdateAccessControlPolicyActiveStatus endpoint
CVSS Score
4.6
EPSS Score
0.0%
EPSS Percentile
0th
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
| CWE | CWE-352 |
| Vendor | mattermost |
| Product | mattermost |
| Published | Mar 25, 2026 |
| Last Updated | Mar 25, 2026 |
Stay Ahead of the Next One
Get instant alerts for mattermost mattermost
Be the first to know when new medium vulnerabilities affecting mattermost mattermost are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
Mattermost / Mattermost
11.2.0 ≤ 11.2.2 10.11.0 ≤ 10.11.10 11.4.0 ≤ 11.4.0 11.3.0 ≤ 11.3.1
Credits
Joshua Rogers