GO-2025-4201 — Vulnetix

GO-2025-4201 PUBLISHED

Mattermost Server is vulnerable to webhook and slash command manipulation in github.com/mattermost/mattermost-server

Affected Products

Vendor	Product	Versions
github.com	mattermost/mattermost-server	4.2.0-rc1+incompatible, 4.3.0-rc1+incompatible, 0

Timeline

Dec 15, 2025 CVE Published
Mar 3, 2026 CVE Updated
May 1, 2026 Security Advisory

References

https://github.com/advisories/GHSA-jp57-4x34-5v94 advisory
https://nvd.nist.gov/vuln/detail/CVE-2017-18889 advisory
https://mattermost.com/security-updates url

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