CVE-2025-20051: Arbitrary file read via block duplication in Mattermost Boards

9.9 CVSS

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.

Classification

CVE ID: CVE-2025-20051

CVSS Base Severity: CRITICAL

CVSS Base Score: 9.9

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

Problem Types

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Affected Products

Vendor: Mattermost

Product: Mattermost

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.08% (probability of being exploited)

EPSS Percentile: 20.14% (scored less or equal to compared to others)

EPSS Date: 2025-03-25 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-20051
https://mattermost.com/security-updates

Timeline