CVE-2025-26621

HIGH

OpenCTI < 6.5.2 - Authenticated Denial of Service via Webhook JavaScript Execution

Title source: llm

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.

References (2)

Core 2

Core References

Vendor Advisory x_refsource_confirm

https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-gq63-jm3h-374p

Not Applicable x_refsource_misc

https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-mf88-g2wq-p7qm

Scores

CVSS v3 7.6

EPSS 0.0035

EPSS Percentile 27.0%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-94 CWE-1321

Status published

Products (1)

citeum/opencti < 6.5.2

Published May 19, 2025

Tracked Since Feb 18, 2026