CVE-2025-36530: Mattermost Fails to Validate File Paths

August 21, 2025 (updated August 29, 2025)

Mattermost versions 10.9.x <= 10.9.1, 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate file paths during plugin import operations which allows restricted admin users to install unauthorized custom plugins via path traversal in the import functionality, bypassing plugin signature enforcement and marketplace restrictions.

References

github.com/advisories/GHSA-gq3r-5833-5532
github.com/mattermost/mattermost
mattermost.com/security-updates
nvd.nist.gov/vuln/detail/CVE-2025-36530
pkg.go.dev/vuln/GO-2025-3901

Code Behaviors & Features

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