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CVE-2026-21886— OpenCTI's GraphQL Mutations Allow Deletion of Unrelated Entities

Quick assessment

Affected
OpenCTI-Platform opencti
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenCTI是OpenCTI开源的一个开放网络威胁情报平台。 OpenCTI 6.9.1之前版本存在安全漏洞，该漏洞源于GraphQL突变缺少验证，可能导致删除不相关和敏感对象。

CVSS 6.5 · Medium EPSS 0.24% · P15

Possible ATT&CK Techniques 1 AI

T1485 · Data Destruction
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I. Basic Information for CVE-2026-21886

Vulnerability Information
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Vulnerability Title
OpenCTI's GraphQL Mutations Allow Deletion of Unrelated Entities
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
OpenCTI 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenCTI是OpenCTI开源的一个开放网络威胁情报平台。 OpenCTI 6.9.1之前版本存在安全漏洞，该漏洞源于GraphQL突变缺少验证，可能导致删除不相关和敏感对象。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenCTI-Platform opencti < 6.9.1 -

II. Public POCs for CVE-2026-21886

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III. Intelligence Information for CVE-2026-21886

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Vendor Advisories for CVE-2026-21886 (1)

IV. Related Vulnerabilities

Same product: opencti
Same vendor: OpenCTI-Platform
Same weakness: CWE-285