🛡️ CVE-2026-39980 — opencti

🔴 CVSS 9.1 — Critical ✅ No Known Exploit CWE-1336 NVD
9.1
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs administrative privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity high, availability high.

Affected software

CVE-2026-39980 is recorded against 2 packages.

  • opencti (fixed in 6.9.5)
  • pycti (fixed in 6.9.5)

Timeline and source

Published on 9 April 2026 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com
github.com

Details

Severity CRITICAL
CVSS Score 9.1
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE CWE-1336
Public Exploit ✅ No
Source NVD
Published 2026-04-09
Updated 2026-08-11
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
opencti — 6.9.5
pycti — 6.9.5

Similar Threats

Exploit Protection

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