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GO-2026-6483

Mattermost doesn't authenticate Atlassian Connect installed callbacks, allowing a remote unauthenticated attacker to inject a rogue sharedSecret in github.com/mattermost/mattermost-server

Quick fix

GO-2026-6483 — 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 authenticate Atlassian Connect installed callbacks, allowing a remote unauthenticated attacker to inject a rogue sharedSecret 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-jqgv-39mg-7c2r[ADVISORY]
https://nvd.nist.gov/vuln/detail/CVE-2026-6673[ADVISORY]
https://mattermost.com/security-updates[WEB]