CVE-2026-27960: Citeum Opencti

Critical severity, CVSS 9.8. EPSS: 1.8% chance of exploitation in the next 30 days.

OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. In versions 6.6.0 through 6.9.12, there is a privilege escalation vulnerability that can be exploited by unauthenticated attackers to query the API as any existing user, including the default admin account. This issue has been fixed in version 6.9.13. As a workaround, the default admin can be disabled using the `APP__ADMIN__EXTERNALLY_MANAGED` configuration.

Affected products

• Citeum Opencti: from 6.9.0, before 6.9.13 (fixed in 6.9.13)

Published 2026-05-05. Last modified 2026-07-25.