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Priviledge escalation and unauthenticated access using default admin

Critical
aHenryJard published GHSA-6vvv-vmfr-xhrx May 4, 2026

Package

OpenCTI

Affected versions

>= 6.6.0, < 6.9.13

Patched versions

>= 6.9.13

Description

Impact

There is a priviledge escalation vulnerability affecting OpenCTI that can be exploited by unauthenticated attackers, and enables to query the API as any existing user including the admin set by default.

Patches

This issue has been fixed since version 6.9.13.

Workarounds

There is no workaround for the priviledge escalation issue. One recommended remediation is to disable the default admin using APP__ADMIN__EXTERNALLY_MANAGED configuration.

Severity

Critical

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVE ID

CVE-2026-27960

Weaknesses

No CWEs

Credits