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LOW 2.7 Go

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

GHSA-mxxh-fmjq-j6x4 · CVE-2026-27769 · GO-2026-5522

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Description

Mattermost versions 10.11.x <= 10.11.12 fail to validate whether users were correctly owned by the correct Connected Workspace which allows a malicious remote server connected using the Conntexted Workspaces feature to change the displayed status of local users via the Connected Workspaces API. Mattermost Advisory ID: MMSA-2026-00603.

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