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CVE-2026-76878 is an authorization flaw affecting OpenStack Aodh before 22.0.1, with related security impact involving OpenStack Watcher. In Aodh, the alarm list API improperly evaluates the all_projects query parameter by checking for the parameter's presence rather than correctly enforcing logic based on its value. When all_projects is true, administrator-only policy is applied, but when it is set to false the code path that would normally constrain results to the caller's project is skipped. As a result, a non-administrative user holding the reader role can enumerate alarms across projects. The flaw can also be combined with a foreign project_id value to retrieve alarms associated with a specific target project. Exposed alarm metadata may include alarm actions that contain trust webhook URLs, Heat signal endpoints, project identifiers, and user identifiers. The issue has additional downstream impact because OpenStack Watcher webhook triggers lack authorization enforcement; an authenticated user who obtains an audit webhook URL can trigger an EVENT audit and its associated action plan regardless of project membership or role.
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