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GO-2026-6482

Mattermost doesn't invalidate cached authentication state for active WebSocket connections during global session revocation in github.com/mattermost/mattermost-server

Quick fix

GO-2026-6482 — github.com/mattermost/mattermost-server: upgrade to the fixed version with the command below.

go get github.com/mattermost/mattermost-server@v10.11.18+incompatible

Details

Mattermost doesn't invalidate cached authentication state for active WebSocket connections during global session revocation 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: 10.11.0+incompatibleFixed in: 10.11.18+incompatible

Fixgo get github.com/mattermost/mattermost-server@v10.11.18+incompatible

References

https://github.com/advisories/GHSA-h998-hxxj-8q83[ADVISORY]
https://nvd.nist.gov/vuln/detail/CVE-2026-9162[ADVISORY]
https://mattermost.com/security-updates[WEB]