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CVE-2026-27960

Citeum Opencti authentication bypass

9.8 CRITICALEPSS 1.80%
  1. Published5 May 2026

Description

OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. In versions 6.6.0 through 6.9.12, there is a privilege escalation vulnerability that can be exploited by unauthenticated attackers to query the API as any existing user, including the default admin account. This issue has been fixed in version 6.9.13. As a workaround, the default admin can be disabled using the `APP__ADMIN__EXTERNALLY_MANAGED` configuration.

CVSS 3.1 breakdown

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

Affected products

Citeum Opencti≥ 6.9.0 < 6.9.13

Remediation

Fixed in
Citeum Opencti≥ 6.9.13

References

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Frequently asked

Is CVE-2026-27960 being actively exploited?

CVE-2026-27960 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.80%.

How severe is CVE-2026-27960?

CVE-2026-27960 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 1.80% probability of exploitation.

Which products are affected by CVE-2026-27960?

Affected products include Citeum Opencti.

How do I fix CVE-2026-27960?

Upgrade affected software to a fixed version, for example Citeum Opencti 6.9.13 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-27960 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.