CRITICAL9.8

GO-2025-4200

Mattermost Server allows attackers to gain privileges by accessing unintended API endpoints with users' credentials in github.com/mattermost/mattermost-server

Quick fix

GO-2025-4200 — github.com/mattermost/mattermost-server: upgrade to the fixed version with the command below.

go get github.com/mattermost/mattermost-server@v4.1.2+incompatible

Details

Mattermost Server allows attackers to gain privileges by accessing unintended API endpoints with users' credentials in github.com/mattermost/mattermost-server

Are you affected?

Enter the version of the package you're using.

Affected packages

Go/github.com/mattermost/mattermost-server

Introduced in: 0Fixed in: 4.1.2+incompatible

Fixgo get github.com/mattermost/mattermost-server@v4.1.2+incompatible

References

https://github.com/advisories/GHSA-g78f-6xq7-rrhq[ADVISORY]
https://nvd.nist.gov/vuln/detail/CVE-2017-18885[ADVISORY]
https://mattermost.com/security-updates[WEB]