Description
Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to validate Advanced Logging file target paths which allows system administrators to read arbitrary host files via malicious AdvancedLoggingJSON configuration in support packet generation. Mattermost Advisory ID: MMSA-2025-00562
Published: 2026-03-26
Score: 6.8 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Arbitrary File Read
Action: Immediate Patch
AI Analysis

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Remediation

Vendor Solution

Update Mattermost to versions 11.5.0, 11.4.1, 11.3.2, 11.2.4, 10.11.12 or higher.

Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-3mw5-466q-295q Mattermost allows system administrators to read arbitrary host files via malicious AdvancedLoggingJSON configuration
References
History

Mon, 30 Mar 2026 19:45:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost mattermost Server
CPEs cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
cpe:2.3:a:mattermost:mattermost_server:11.4.0:*:*:*:*:*:*:*
Vendors & Products Mattermost mattermost Server

Fri, 27 Mar 2026 08:45:00 +0000

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

Thu, 26 Mar 2026 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Thu, 26 Mar 2026 16:45:00 +0000

Type Values Removed Values Added
Description Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to validate Advanced Logging file target paths which allows system administrators to read arbitrary host files via malicious AdvancedLoggingJSON configuration in support packet generation. Mattermost Advisory ID: MMSA-2025-00562
Title Arbitrary File Read via Advanced Logging Support Packet
Weaknesses CWE-22
References
Metrics cvssV3_1

{'score': 6.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N'}


Subscriptions

Mattermost Mattermost Mattermost Server
cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published:

Updated: 2026-03-26T16:51:15.488Z

Reserved: 2026-02-24T10:55:16.031Z

Link: CVE-2026-3112

cve-icon Vulnrichment

Updated: 2026-03-26T16:51:12.964Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-26T17:16:42.123

Modified: 2026-03-30T19:42:39.833

Link: CVE-2026-3112

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-03-30T20:57:40Z

Weaknesses