OpenCTI up to 6.9.0 API IndividualDeletionDeleteMutation improper authorization

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k0.17

Summaryinfo

A vulnerability, which was classified as critical, was found in OpenCTI up to 6.9.0. Affected by this issue is the function IndividualDeletionDeleteMutation of the component API. Such manipulation leads to improper authorization. This vulnerability is traded as CVE-2026-21886. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in OpenCTI up to 6.9.0 and classified as critical. Affected by this issue is the function IndividualDeletionDeleteMutation of the component API. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-21886 since 01/05/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1548.002 by the MITRE ATT&CK project.

Upgrading to version 6.9.1 eliminates this vulnerability.

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Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.2

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 8.1
NVD Vector: 🔒

CNA Base Score: 6.5
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper authorization
CWE: CWE-285 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: OpenCTI 6.9.1

Timelineinfo

01/05/2026 CVE reserved
03/17/2026 +71 days Advisory disclosed
03/17/2026 +0 days VulDB entry created
03/21/2026 +4 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-21886 (🔒)
GCVE (CVE): GCVE-0-2026-21886
GCVE (VulDB): GCVE-100-351374

Entryinfo

Created: 03/17/2026 16:52
Updated: 03/21/2026 19:31
Changes: 03/17/2026 16:52 (64), 03/21/2026 19:31 (12)
Complete: 🔍
Cache ID: 216::103

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