CVE-2026-27659
MEDIUM EPSS 2.4%
Published Mar 25, 20263mo ago · Modified Jun 17, 20262w ago
4.6 CVSS 3.1
Published Mar 25, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago
Description
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
CVSS Details
Base Score
Exploitability
Impact
Vector string
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
Threat Intelligence
EPSS Exploit Probability
2.4% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-352 Cross-Site Request Forgery (CSRF) Authentication
Affected Products 4
| Vendor | Product | Version | Range |
|---|---|---|---|
| mattermost | mattermost_server | * | ≥10.11.0 – <10.11.11 |
| mattermost | mattermost_server | * | ≥11.2.0 – <11.2.3 |
| mattermost | mattermost_server | * | ≥11.3.0 – <11.3.2 |
| mattermost | mattermost_server | * | ≥11.4.0 – <11.4.1 |
References 1
- mattermost.com https://mattermost.com/security-updates
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.