CVE-2026-2462 MEDIUM

CVE-2026-2462: Admin RCE via Malicious Plugin Upload on CI Test Instances

Vendor Mattermost
Product Mattermost
Weakness CWE-863 · Incorrect authorization
Published March 16, 2026
Last update March 17, 2026
View on NVD All CVEs

CVSS base score

6.6/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction None
Confidentiality Low
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to restrict plugin installation on CI test instances with default admin credentials which allows an unauthenticated attacker to achieve remote code execution and exfiltrate sensitive configuration data including AWS and SMTP credentials via uploading a malicious plugin after changing the import directory. Mattermost Advisory ID: MMSA-2025-00528

Key dates

02Disclosure timeline

March 16, 2026 CVE published
March 17, 2026 Record updated