CVE-2025-26621 - CVE House

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Status published High CVE-2025-26621

OpenCTI vulnerable to Denial of Service through web hook

7.6 CVSS

Vulnerability Description

OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Prior to version 6.5.2, any user with the capability manage customizations can edit webhook that will execute javascript code. This can be abused to cause a denial of service attack by prototype pollution, making the node js server running the OpenCTI frontend become unavailable. Version 6.5.2 fixes the issue.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

More from OpenCTI-Platform

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Open Redirect in OpenCTI's SAML Authentication Flow

GraphQL IDOR allows authenticated user to delete workspace content of other users

OpenCTI's GraphQL IDOR enables authenticated users to modify or delete notifications of other users

OpenCTI has remote code execution and sensitive secrets exposed through web hook

OpenCTI bypass of protected attribute update

Affected Vendor

OpenCTI-Platform

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Affected Software

opencti

Vulnerable Versions:

< 6.5.2

Timeline

Official Publish: May 19th, 2025

Last Modified: May 19th, 2025

Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:H

Weaknesses (CWE)

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application

T1059 Command and Scripting Interpreter

T1505.003 Web Shell

T1105 Ingress Tool Transfer

Command and Control

T1565.002 Stored Data Manipulation