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
Published: 2026-03-16
Score: 6.6 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Remote Code Execution
Action: Patch Now
AI Analysis

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Remediation

Vendor Solution

Update Mattermost to versions 11.4.0, 11.3.1, 11.2.3, 10.11.11 or higher.

Tracking

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Advisories

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References
History

Mon, 30 Mar 2026 07:15:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost server
Vendors & Products Mattermost server

Wed, 18 Mar 2026 18:45:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost Server
CPEs cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Vendors & Products Mattermost
Mattermost mattermost Server

Mon, 16 Mar 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 16 Mar 2026 12:15:00 +0000

Type Values Removed Values Added
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
Title Admin RCE via Malicious Plugin Upload on CI Test Instances
Weaknesses CWE-863
References
Metrics cvssV3_1

{'score': 6.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L'}


Subscriptions

Mattermost Mattermost Server Server
cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published:

Updated: 2026-03-17T03:55:27.849Z

Reserved: 2026-02-13T11:21:17.796Z

Link: CVE-2026-2462

cve-icon Vulnrichment

Updated: 2026-03-16T13:43:44.074Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-16T14:19:30.010

Modified: 2026-03-18T18:31:45.873

Link: CVE-2026-2462

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-03-30T07:02:31Z

Weaknesses