---
id: CVE-2025-25279
aliases:
  - GHSA-5fwx-p6xh-vjrh
  - GO-2025-3480
title: Mattermost allows reading arbitrary files related to importing boards
summary: Mattermost allows reading arbitrary files related to importing boards
severity: critical
cvss: 9.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
vendor: mattermost
product: github.com/mattermost/mattermost/server/v8
ecosystem: go
affected:
  - >-
    github.com/mattermost/mattermost/server/v8 <
    8.0.0-20250122165010-4ed702ccff4e
  - 'github.com/mattermost/mattermost/server/v8 >= 9.11.0-rc1, < 9.11.8'
  - 'github.com/mattermost/mattermost/server/v8 >= 10.2.0-rc1, < 10.2.3'
  - 'github.com/mattermost/mattermost/server/v8 >= 10.3.0-rc1, < 10.3.3'
  - 'github.com/mattermost/mattermost/server/v8 >= 10.4.0-rc1, < 10.4.2'
patched:
  - github.com/mattermost/mattermost/server/v8 8.0.0-20250122165010-4ed702ccff4e
  - github.com/mattermost/mattermost/server/v8 9.11.8
  - github.com/mattermost/mattermost/server/v8 10.2.3
  - github.com/mattermost/mattermost/server/v8 10.3.3
  - github.com/mattermost/mattermost/server/v8 10.4.2
published: '2025-02-24'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:50:22.367474853Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-5fwx-p6xh-vjrh'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-25279'
  - url: >-
      https://github.com/mattermost/mattermost-plugin-boards/commit/025ce8d363a054473bc002f43f602a4032d38c06
  - url: >-
      https://github.com/mattermost/mattermost/commit/4ed702ccff4ec3c9eff832a9b6060f9f4454141d
  - url: 'https://github.com/mattermost/mattermost'
  - url: 'https://mattermost.com/security-updates'
tags:
  - osv
  - go
  - exploit-available
epss: 0.24041
epssPercentile: 0.97765
exploits:
  github: 2
  githubRepos:
    - 'https://github.com/numanturle/CVE-2025-25279'
    - >-
      https://github.com/AbokorMAHAMMADMOUSSE/CVE-2025-25279-Mattermost-Path-Traversal
  checkedAt: '2026-09-26T09:05:33.135Z'
exploitAvailable: true
ingestedAt: '2026-09-12T03:13:01.755Z'
---

## Overview

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.

## Affected packages

- `github.com/mattermost/mattermost/server/v8 < 8.0.0-20250122165010-4ed702ccff4e`
- `github.com/mattermost/mattermost/server/v8 >= 9.11.0-rc1, < 9.11.8`
- `github.com/mattermost/mattermost/server/v8 >= 10.2.0-rc1, < 10.2.3`
- `github.com/mattermost/mattermost/server/v8 >= 10.3.0-rc1, < 10.3.3`
- `github.com/mattermost/mattermost/server/v8 >= 10.4.0-rc1, < 10.4.2`

## Remediation

Upgrade to a patched release:

- `github.com/mattermost/mattermost/server/v8 8.0.0-20250122165010-4ed702ccff4e`
- `github.com/mattermost/mattermost/server/v8 9.11.8`
- `github.com/mattermost/mattermost/server/v8 10.2.3`
- `github.com/mattermost/mattermost/server/v8 10.3.3`
- `github.com/mattermost/mattermost/server/v8 10.4.2`