CVE-2026-39980: OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables

Q: How do I fix CVE-2026-39980?

opencti: upgrade to 6.9.5. Exact commands for each OS are on this page.

Q: Is CVE-2026-39980 being exploited?

CVE-2026-39980 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-39980 affect?

CVE-2026-39980 affects opencti. Severity is critical (CVSS 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 arbitr

Q: How urgent is CVE-2026-39980?

Priority 55/100. Critical severity; Public exploit reference

This month

CRITICAL 9.1UPGRADE

CVE-2026-39980 is a critical-severity flaw (CVSS 9.1) affecting opencti. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	1.4% (top 29%)
CISA exploited list	No
Weakness	CWE-1336
Published	2026-04-09
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: citeum

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-09 18:17 UTCPublished CVE record published
2026-06-17 10:42 UTCUpdated Record last modified

citeum opencti UPGRADE

Affected: < 6.9.5

Fixed in: 6.9.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy opencti || rpm -q opencti || opencti --version

2. UPGRADE to 6.9.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade opencti

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade opencti

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Metasploit: OpenCTI Authentication Bypass and Notifier EJS Remote Code Execution

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-39980?

opencti: upgrade to 6.9.5. Exact commands for each OS are on this page.

Is CVE-2026-39980 being exploited?

CVE-2026-39980 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-39980 affect?

CVE-2026-39980 affects opencti. Severity is critical (CVSS 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 arbitr

How urgent is CVE-2026-39980?

Priority 55/100. Critical severity; Public exploit reference

Related CVEs

CVE-2026-35211 MEDIUM 6.5 UPGRADE OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables
CVE-2026-35210 HIGH 7.1 UPGRADE OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables
CVE-2026-27960 CRITICAL 9.8 UPGRADE OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables
CVE-2026-44730 HIGH 7.2 UPGRADE OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables
CVE-2026-35212 MEDIUM 6.1 UPGRADE OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables

References

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