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CVE-2026-39980

Citeum Opencti vulnerability

9.1 CRITICALEPSS 0.69%
  1. Published9 Apr 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredHigh
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected products

Citeum Opencti< 6.9.5

Remediation

Fixed in
Citeum Opencti≥ 6.9.5

References

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Frequently asked

Is CVE-2026-39980 being actively exploited?

CVE-2026-39980 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.69%.

How severe is CVE-2026-39980?

CVE-2026-39980 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.69% probability of exploitation.

Which products are affected by CVE-2026-39980?

Affected products include Citeum Opencti.

How do I fix CVE-2026-39980?

Upgrade affected software to a fixed version, for example Citeum Opencti 6.9.5 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-39980 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.