Vulnerability · Published Mar 17, 2026 · Assigned by GitHub_M
CVE-2026-21886OpenCTI's GraphQL Mutations Allow Deletion of Unrelated Entities
Medium 6.5
In plain English
A medium-severity security flaw in opencti from OpenCTI-Platform. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 objects respectively. However, it was observed that this mutation can be misused to delete unrelated and sensitive objects such as analyses reports etc. This behavior stems from the lack of validation in the API to ensure that the targeted object is contextually related to the mutation being executed. Version 6.9.1 fixes the issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | pycti | 6.9.1 | PYSEC-2026-117 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| OpenCTI-Platform | opencti | < 6.9.1 |
Weakness: CWE-285, CWE-566, CWE-915 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H