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Medium, CVSS 6.8

Mattermost Path Traversal vulnerability

CVE-2025-6233GHSA-wvw2-3jh4-4c39

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (github.com/mattermost/mattermost/server/v8 8.0.0-20250529054450-d38c27f96fcf; github.com/mattermost/mattermost-server 10.8.2, 10.7.4, 10.5.8, 9.11.17), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

  • GitHub Advisory Database and maintainer security advisories on GitHub

    GitHub-reviewed advisory GHSA-wvw2-3jh4-4c39 lists affected ranges: Go github.com/mattermost/mattermost-server >=10.8.0 =10.7.0 =10.5.0 =9.11.0 =0 <8.0.0-20250529054450-d38c27f96fcf

    VerifiedObserved Structured GitHub Advisory Database record (type=reviewed) from the GitHub REST API.

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
6.8 · CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
EPSS
  • CVE-2025-6233: 0.45% estimated exploitation activity in the next 30 days; percentile 38.85 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Mattermost versions 10.8.x <= 10.8.1, 10.7.x <= 10.7.3, 10.5.x <= 10.5.7, 9.11.x <= 9.11.16 fail to sanitize input paths of file attachments in the bulk import JSONL file, which allows a system admin to read arbitrary system files via path traversal.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-wvw2-3jh4-4c39

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2025-6233

Advisory: Mattermost Path Traversal vulnerability
IDs: CVE-2025-6233, GHSA-wvw2-3jh4-4c39
Record: https://patchnext.com/advisories/cve-2025-6233 (revision 1, source checked 26 Oct 2026, 15:09 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/mattermost/mattermost/server/v8 8.0.0-20250529054450-d38c27f96fcf; github.com/mattermost/mattermost-server 10.8.2, 10.7.4, 10.5.8, 9.11.17. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/mattermost/mattermost/server/v8: affected < 8.0.0-20250529054450-d38c27f96fcf; fixed in 8.0.0-20250529054450-d38c27f96fcf
- Go github.com/mattermost/mattermost-server: affected >= 10.8.0, < 10.8.2; >= 10.7.0, < 10.7.4; >= 10.5.0, < 10.5.8; >= 9.11.0, < 9.11.17; fixed in 10.7.4, 9.11.17, 10.5.8, 10.8.2

## Suggested inspection (read-only)
- Go github.com/mattermost/mattermost/server/v8: check the installed version with your package manager.
- Go github.com/mattermost/mattermost-server: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/mattermost/mattermost/server/v8, github.com/mattermost/mattermost-server.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-wvw2-3jh4-4c39 (GitHub-reviewed advisory GHSA-wvw2-3jh4-4c39 lists affected ranges: Go github.com/mattermost/mattermost-server >=10.8.0 =10.7.0 =10.5.0 =9.11.0 =0 <8.0.0-20250529054450-d38c27f96fcf)

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