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CVE-2025-25279

CriticalPublished

Arbitrary file read in Mattermost Boards via import & export board archive

Published: Feb 24, 2025
Updated: Feb 24, 2025
Assigning CNA: Mattermost
Evidence observed: Aug 8, 2026

Primary CVSS

9.9/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

24.0%

Moderate · next 30 days

Percentile: 97.8%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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 board blocks when importing boards which allows an attacker could read any arbitrary file on the system via importing and exporting a specially crafted import archive in Boards.

Sources

CVE-2025-25279-Mattermost-Path-TraversalPoC
Proof-of-concept exploit for CVE-2025-25279, a Mattermost Focalboard path traversal enabling authenticated arbitrary file read and exfiltration of sensitive files.
CVE-2025-25279PoC
Proof-of-concept for CVE-2025-25279: path traversal in Mattermost Boards allows arbitrary file read via crafted import archive and board duplication.

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