What is CVE-2026-21886?

CVE-2026-21886 is a medium-severity vulnerability in Opencti-platform Opencti, classified under Improper Authorization. CVSS score: 6.5/10. Published 2026-03-17.

How severe is CVE-2026-21886?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Opencti-platform Opencti

CVE-2026-21886

OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Prior to version 6.9.1, the GraphQL mutations "IndividualDeletionDeleteMutation" is intended to allow users to delete individual entity ob…

EPSS: 0.002 (37.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Opencti-platform Opencti — versions < 6.9.1

Weakness classification (CWE)

CWE-285 — Improper Authorization
CWE-566 — Authorization Bypass Through User-Controlled SQL Primary Key
CWE-915 — Improperly Controlled Modification of Dynamically-Determined Object Attributes

References

https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-mhmx-j75v-2m6x (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-21886?: CVE-2026-21886 is a medium-severity vulnerability in Opencti-platform Opencti, classified under Improper Authorization. CVSS score: 6.5/10. Published 2026-03-17.
How severe is CVE-2026-21886?: Medium severity. CVSS v3 base score is 6.5 out of 10.