CVE-2026-39980

critical · 9.1

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.

9.1

CVSS

0.5%

EPSS (exploit prob.)

43rd

EPSS percentile

2026-04-09

Published

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

Weaknesses

CWE-1336

Affected products

Vendor	Product	Affected versions
citeum	opencti	< 6.9.5

Check a specific version with /api/v1/cve/match.

References

https://github.com/OpenCTI-Platform/opencti/releases/tag/6.9.5
https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-jv9r-jw2f-rhrf

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-39980