CVE-2025-20086: Mattermost fails to properly validate post props

January 15, 2025 (updated January 17, 2025)

Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate post props which allows a malicious authenticated user to cause a crash via a malicious post.

References

github.com/advisories/GHSA-5m7j-6gc4-ff5g
github.com/mattermost/mattermost
mattermost.com/security-updates
nvd.nist.gov/vuln/detail/CVE-2025-20086
pkg.go.dev/vuln/GO-2025-3392

Code Behaviors & Features

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