CVE-2026-2462

MEDIUM

Admin RCE via Malicious Plugin Upload on CI Test Instances

Title source: cna

Description

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

References (1)

[Vendor Advisory] https://mattermost.com/security-updates

Scores

CVSS v3 6.6

EPSS 0.0019

EPSS Percentile 41.2%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-863

Status published

Products (8)

Mattermost/Mattermost 10.11.0 - 10.11.10

Mattermost/Mattermost 10.11.11

Mattermost/Mattermost 11.2.0 - 11.2.2

Mattermost/Mattermost 11.2.3

Mattermost/Mattermost 11.3.0

Mattermost/Mattermost 11.3.1

Mattermost/Mattermost 11.4.0

mattermost/mattermost_server 10.11.0 - 10.11.11

Published Mar 16, 2026

Tracked Since Mar 16, 2026