CVE-2026-21886

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{"affected": [{"affectedData": [{"product": "opencti", "vendor": "OpenCTI-Platform", "versions": [{"status": "affected", "version": "< 6.9.1"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:citeum:opencti:*:*:*:*:*:*:*:*", "matchCriteriaId": "770FF6DC-74FC-4739-8A2E-A554D43CF7A9", "versionEndExcluding": "6.9.1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "OpenCTI es una plataforma de c\u00f3digo abierto para gestionar conocimiento de inteligencia de amenazas cibern\u00e9ticas y observables. Antes de la versi\u00f3n 6.9.1, la mutaci\u00f3n de GraphQL 'IndividualDeletionDeleteMutation' est\u00e1 destinada a permitir a los usuarios eliminar objetos de entidad individuales respectivamente. Sin embargo, se observ\u00f3 que esta mutaci\u00f3n puede ser mal utilizada para eliminar objetos no relacionados y sensibles, como informes de an\u00e1lisis, etc. Este comportamiento se deriva de la falta de validaci\u00f3n en la API para asegurar que el objeto objetivo est\u00e9 contextualmente relacionado con la mutaci\u00f3n que se est\u00e1 ejecutando. La versi\u00f3n 6.9.1 corrige el problema."}], "id": "CVE-2026-21886", "lastModified": "2026-06-17T10:19:05.520", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-21886", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-17T16:09:27.056285Z", "version": "2.0.3"}}]}, "published": "2026-03-17T16:16:19.953", "references": [{"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-mhmx-j75v-2m6x"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-285"}, {"lang": "en", "value": "CWE-566"}, {"lang": "en", "value": "CWE-915"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.9.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "opencti", "source": "cna", "vendor": "OpenCTI-Platform"}, "product": "opencti", "vendor": "opencti-platform"}], "analysis": {"en": {"generated_at": "2026-03-19T21:24:41.482022+00:00", "value": {"mitigation_remediation": ["Update OpenCTI to version 6.9.1 or later to apply the patch that enforces contextual validation.", "Verify that role-based access controls are correctly configured after the update to limit deletion privileges.", "Monitor audit logs for unexpected deletions or anomalous API activity to detect any potential abuse."], "summary": {"action": "Apply Patch", "impact": "Unauthorized Deletion of Sensitive Data"}, "threat_synthesis": {"affected_systems": "OpenCTI-Platform (opencti) versions prior to 6.9.1 are affected. The fix was released in version 6.9.1, which adds contextual validation to the mutation.", "description_and_impact": "The OpenCTI GraphQL mutation \"IndividualDeletionDeleteMutation\" was designed to delete individual entity objects. However, due to missing validation of the target object\u2019s relationship with the mutation, an attacker can delete unrelated and sensitive entities such as analysis reports. This flaw is an authorization bypass and permission escalation vulnerability (CWE-285, CWE-566, CWE-915). The consequence is loss of critical threat intelligence, potentially compromising the integrity of the knowledge base and hindering future threat analysis.", "risk_and_exploitability": "The vulnerability carries a CVSS score of 6.5, indicating a moderate severity. EPSS indicates a less than 1% probability of exploitation, and the issue is not listed in the CISA KEV catalog. Based on the description, it is inferred that the likely attack vector is authenticated GraphQL API calls; an attacker with any level of user access may exploit the mutation to delete unwanted data if the system has not been updated to 6.9.1 or later."}}}}, "created": "2026-03-18T12:13:18.781339+00:00", "updated": "2026-03-24T10:49:13.495848+00:00", "vendors": ["opencti-platform", "opencti-platform$PRODUCT$opencti"]}