Which products and versions are affected by CVE-2026-27960?

Affected: Opencti (Citeum) versions >= >= 6.6.0, = 6.9.0. The full list is in the CVE brief.

Is CVE-2026-27960 being exploited in the wild?

It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Sep 21, 2026.

Is CVE-2026-27960 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2026-27960?

Public exploit code is available.

Is there a fix for CVE-2026-27960?

Fixed versions are available, including Opencti 6.9.13, pycti 6.9.13.

How urgently should CVE-2026-27960 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2026-27960

CriticalExploitedPublic exploit

OpenCTI privilege escalation and unauthenticated access via default admin account

Published May 5, 2026 · Updated Aug 12, 2026 · Also known as GHSA-6vvv-vmfr-xhrx, PYSEC-2026-119

Key Facts

Patch immediately

CVE-2026-27960 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Opencti (Citeum), pycti (pypi).
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Sep 21, 2026. Public exploit code is available.
EPSS estimates a 4.7% probability of exploitation in the next 30 days.
Fixed versions are available, including Opencti 6.9.13, pycti 6.9.13.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

9.8

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS (30-day exploit likelihood)

4.7%

Higher than 91.6% of all scored CVEs

Exploited in the wild

Yes

2 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2026-27960 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

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 APPADMINEXTERNALLY_MANAGED configuration.

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
Industry KEV feed	Sep 21, 2026	n/a	Not reported
CIRCL KEV	Sep 21, 2026	n/a	Not reported

Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Affected Products

3 affected entries in total

Product	Affected versions	Fixed in
OpenctiCiteum	>= >= 6.6.0, < 6.9.13	6.9.13
pyctipypi	>= 6.9.0	6.9.13

Patched Releases

Opencti

6.9.13

pycti

6.9.13

Timeline

Publicly disclosed
May 5, 2026
Last updated
Aug 12, 2026
Added to Industry KEV feed
Sep 21, 2026
Added to CIRCL KEV
Sep 21, 2026

Weakness Type

CWE-287 Improper Authentication

References

9 more references in the full CVE brief

FAQ

Common Questions.

OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables.
Affected: Opencti (Citeum) versions >= >= 6.6.0, < 6.9.13; pycti (pypi) versions >= 6.9.0. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Sep 21, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Opencti 6.9.13, pycti 6.9.13.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2026-27960 Running On Your Attack Surface?

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