VULNERABILITY INTELLIGENCE

CVE-2026-27769

CVSS score2.7 LOW

EPSS probability0.17%

CISA KEVNot currently listed

Published2026-04-15

Last modified2026-06-17

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