What’s Vulnerable › Vulnerabilities
CVE-2026-21886: OpenCTI's GraphQL Mutations Allow Deletion of Unrelated Entities
- Severity: high (CVSS 8.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-03-17 · updated 2026-06-17
- Weakness: CWE-285
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 products
- OpenCTI-Platform opencti: before 6.9.1 — fixed in 6.9.1
How to fix
Upgrade to a fixed version: OpenCTI-Platform opencti 6.9.1. Check the vendor advisory for mitigations.
References
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