Risk Letters

Exploited vulnerability

CVE-2026-27960

TLP:CLEAR

citeum opencti Improper Authentication

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 disab

Facts

  • Vendor: citeum
  • Product: OpenCTI is
  • CVSS: 9.8
  • EPSS (probability of exploitation within 30 days): 7.1 %
  • First known exploitation: 21 September 2026
  • First seen by Risk Letters: 5 May 2026

Members see which Nordic sectors the flaw hits, and what to do about it.

Get the full brief

Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD