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TI-2026-17587 Aliases CVE-2026-21886

OpenCTI's GraphQL Mutations Allow Deletion of Unrelated Entities

Priority LOW 35CWE-285Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass, Tampering
Confidentiality · integrity · availability
None · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-285 and CWE-915.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0024 15th percentileScored 2026-11-07
Fix Fixed opencti (OpenCTI-Platform): 6.9.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
OpenCTI-Platformopenctibefore 6.9.16.9.1Patch availableCNA
  • opencti VendorOpenCTI-Platform Affected before 6.9.1 Fixed in 6.9.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:citeum:opencti:*:*:*:*:*:*:*:*before 6.9.1VulnerableOpenCTI-Platform
  • cpe:2.3:a:citeum:opencti:*:*:*:*:*:*:*:* Versions before 6.9.1 Vulnerable ·OpenCTI-Platform

Remediation

  • Fix · CNA opencti (OpenCTI-Platform) Fixed in 6.9.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-21886

References

Advisory 1

  • TI-2024-24682 OpenCTI May Bypass Introspection Restriction CVSS 3.1HIGH 8.2
  • TI-2024-30453 OpenCTI's lack of Rate Limit lead to OTP brute forcing CVSS 3.1HIGH 8.1
  • TI-2020-19176 OpenCTI 3.3.1 - Directory Traversal CVSS 4.0HIGH 7.1
  • TI-2026-22303 OpenCTI privilege escalation and unauthenticated access via default admin account CVSS 3.1CRITICAL 9.8
  • TI-2020-19179 OpenCTI 3.3.1 - Cross Site Scripting CVSS 4.0MEDIUM 5.1
  • TI-2024-30771 OpenCTI leaks support information due to inadequate access control CVSS 3.1MEDIUM 4.3
See all 21 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences