CVE-2025-20051 - CVE House
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Status published Critical CVE-2025-20051

Arbitrary file read via block duplication in Mattermost Boards

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • visat

References

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Affected Vendor

Affected Software

Mattermost
Vulnerable Versions:
10.4.0, 9.11.0, 10.3.0, 10.2.0, 10.5.0, 10.4.2, 9.11.8, 10.3.3, 10.2.3

Timeline

Official Publish: February 24th, 2025
Last Modified: February 24th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Weaknesses (CWE)

CWE-22

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1005 Data from Local System
Collection
T1552 Unsecured Credentials
Credential Access
T1565.001 Stored Data Manipulation
Impact