CVE-2026-27960 Details.
OpenCTI < 6.9.13 - Authentication Bypass via User Impersonation
Atlas does not check this one. Needs requests that change data.
To test for this one, the check would have to send requests that could change data on the site. Atlas only ever reads public pages, so it does not run this check.
About CVE-2026-27960. What It Means.
OpenCTI < 6.9.13 allows authentication bypass by supplying a Bearer token set to the admin user's internal_id UUID instead of a valid JWT. The default admin internal_id (88ec0c6a-13ce-5e39-b486-354fe4a7084f) grants full admin access to the GraphQL API, effectively bypassing all authentication.
Affected Product. What Is Hit.
- Vendor
- opencti
- Product
- OpenCTI
FAQ
Common Questions.
OpenCTI < 6.9.13 - Authentication Bypass via User Impersonation. OpenCTI < 6.9.13 allows authentication bypass by supplying a Bearer token set to the admin user's internal_id UUID instead of a valid JWT. The default admin internal_id (88ec0c6a-13ce-5e39-b486-354fe4a7084f) grants full admin access to the GraphQL API, effectively bypassing all authentication.
No. To test for this one, the check would have to send requests that could change data on the site. Atlas only ever reads public pages, so it does not run this check. The facts about CVE-2026-27960 are on this page, and you can request a demo to see how Brandefense watches your whole external attack surface.
CVE-2026-27960 is not on the CISA Known Exploited Vulnerabilities list at the time of writing, but it is still worth fixing.
Update OpenCTI to the latest version from the vendor, or follow the vendor's advice to switch off the affected feature. Vendor links are listed on this page when they are known.
This page lists the public facts about CVE-2026-27960. Atlas does not run a check for it, so nothing here says whether a particular site is affected.