Bug 2458654 (CVE-2026-27769) - CVE-2026-27769 mattermost: connected workspaces: malicious remote server can manipulate arbitrary user's status
Summary: CVE-2026-27769 mattermost: connected workspaces: malicious remote server can ...
Keywords:
Status: NEW
Alias: CVE-2026-27769
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2458724 2458725
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-15 11:01 UTC by OSIDB Bzimport
Modified: 2026-04-17 17:53 UTC (History)
0 users

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Description OSIDB Bzimport 2026-04-15 11:01:37 UTC 
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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