Mattermost doesn't validate whether users were correctly owned by the correct Connected Workspace

Description

References

• nvd.nist.gov/vuln/detail/CVE-2026-27769 · ADVISORY
• mattermost/mattermost · PACKAGE
• mattermost.com/security-updates · WEB
• GitHub Advisory GHSA-mxxh-fmjq-j6x4 · ADVISORY

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