Auth bypass in Citeum Opencti
CVE-2026-27960
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 quer…
Vulnerability class: Broken Authentication
EPSS: 0.001 (24.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Citeum Opencti
- Opencti-platform Opencti — versions >= 6.6.0, < 6.9.13
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-27960?
- CVE-2026-27960 is a critical-severity vulnerability in Citeum Opencti, classified under Improper Authentication. CVSS score: 9.8/10. Published 2026-05-05.
- How severe is CVE-2026-27960?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2026-27960 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.