CVE-2025-20051

Arbitrary file read via block duplication in Mattermost Boards

Published Feb 24, 2025 CVSS 3.1 · 9.9 Critical EPSS < 1% KEV · Not listed
Description
Mattermost versions 10.4.x <= 10.4.1, 9.11.x <= 9.11.7, 10.3.x <= 10.3.2, 10.2.x <= 10.2.2 fail to properly validate input when patching and duplicating a board, which allows a user to read any arbitrary file on the system via duplicating a specially crafted block in Boards.

Remediation

Vendor Solution

Update Mattermost to versions 10.5.0, 10.4.2, 9.11.8, 10.3.3, 10.2.3 or higher. Alternatively, update the Mattermost Boards plugin to v9.0.5 or higher.

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2025-4306 Mattermost versions 10.4.x <= 10.4.1, 9.11.x <= 9.11.7, 10.3.x <= 10.3.2, 10.2.x <= 10.2.2 fail to properly validate input when patching and duplicating a board, which allows a user to read any arbitrary file on the system via duplicating a specially crafted block in Boards.
Github GHSA Github GHSA GHSA-v469-7wp6-7cvp Mattermost allows reading arbitrary files
References
History
Type Values Removed Values Added
First Time appeared Mattermost mattermost Server
CPEs cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Vendors & Products Mattermost mattermost Server
Type Values Removed Values Added
Metrics ssvc

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

Type Values Removed Values Added
Description Mattermost versions 10.4.x <= 10.4.1, 9.11.x <= 9.11.7, 10.3.x <= 10.3.2, 10.2.x <= 10.2.2 fail to properly validate input when patching and duplicating a board, which allows a user to read any arbitrary file on the system via duplicating a specially crafted block in Boards.
Title Arbitrary file read via block duplication in Mattermost Boards
Weaknesses CWE-22
References
Metrics cvssV3_1

{'score': 9.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Mattermost
Published
Updated
Feb 24, 2025, 11:20 AM
Reserved
Feb 18, 2025, 11:11 AM
Status
Analyzed
Published
Feb 24, 2025, 8:15 AM
Modified
Jun 17, 2026, 8:40 AM