CVE-2026-39980 — CRITICAL (9.1)

Q: How severe is CVE-2026-39980?

CVE-2026-39980 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.

Q: Is there a patch for CVE-2026-39980?

Check the references section above for vendor advisories and patch information. Affected products include: Citeum Opencti.

Vulnerability Description

OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Prior to 6.9.5, the safeEjs.ts file does not properly sanitize EJS templates. Users with the Manage customization capability can run arbitrary JavaScript in the context of the OpenCTI platform process during notifier template execution. This vulnerability is fixed in 6.9.5.

CVSS Score

9.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

CHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Citeum	Opencti	< 6.9.5

Related Weaknesses (CWE)

CWE-1336

References

https://github.com/OpenCTI-Platform/opencti/releases/tag/6.9.5ProductRelease Notes
https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-jv9r-jw2f-rVendor Advisory

FAQ

What is CVE-2026-39980?

CVE-2026-39980 is a vulnerability with a CVSS score of 9.1 (CRITICAL). OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Prior to 6.9.5, the safeEjs.ts file does not properly sanitize EJS templates. Users with the Manage...

How severe is CVE-2026-39980?

CVE-2026-39980 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-39980?

Check the references section above for vendor advisories and patch information. Affected products include: Citeum Opencti.