CVE-2026-27960 (GCVE-0-2026-27960)

Vulnerability from cvelistv5 – Published: 2026-05-05 18:35 – Updated: 2026-05-06 15:17
VLAI Previdian
Title
OpenCTI privilege escalation and unauthenticated access via default admin account
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-06 15:16 UTC
CWE
  • CWE-287 - Improper Authentication
Assigner
References
Impacted products
Vendor Product Version CPE status
OpenCTI-Platform opencti Affected: >= 6.6.0, < 6.9.13
guessed Create a notification for this product.
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 1506b02f-740a-4c0e-99f7-23a89054d52e

Vulnerability ID: CVE-2026-27960

Status: Confirmed

Status Updated: 2026-09-21 08:06 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-21
Asserted: 2026-09-21
Scope
Notes: OpenCTI privilege escalation and unauthenticated access via default admin account | Affected: OpenCTI-Platform / opencti | CVSS: 9.8 (CRITICAL) | EPSS: 0.01995 | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title OpenCTI privilege escalation and unauthenticated access via default admin account
Cve Id CVE-2026-27960
Vendor OpenCTI-Platform
Ghsa Id None
Product opencti
Added Date 2026-09-21T08:06:49.239Z
Cvss Score 9.8
Epss Score 0.01995
Previous Ids
Cvss Severity CRITICAL
Virtual Patch False
Cvss Estimated False
Epss Percentile 0.79575
Used In Malware unknown
Vulnerability Id CVE-2026-27960
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-09-22 09:00 UTC | Updated: 2026-09-22 09:00 UTC
Show details on NVD website
To clipboard 

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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.