CVE-2026-27769 — Connected Workspaces: Malicious remote server can manipulate arbitrary user's status

CVE-2026-27769

Connected Workspaces: Malicious remote server can manipulate arbitrary user's status PUBLISHED

Description (CNA)

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

Affected (CNA)

Vendor / product	Versions
Mattermost / Mattermost	affected 10.11.0 through 10.11.12; unaffected 11.5.0; unaffected 10.11.13

CWE

CWE-862

References

https://mattermost.com/security-updates

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.