CVE-2026-39980

CRITICAL 9.1

OpenCTI affected by RCE via notifier template

CVSS Score

9.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-1336
Vendor	opencti-platform
Product	opencti
Published	Apr 9, 2026
Last Updated	Apr 9, 2026

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CVSS v3 Breakdown

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 Versions

OpenCTI-Platform / opencti

< 6.9.5

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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