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CVE-2025-26621: OpenCTI vulnerable to Denial of Service through web hook
7.6
CVSS
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.
Classification
CVE ID: CVE-2025-26621
CVSS Base Severity: HIGH
CVSS Base Score: 7.6
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:H
Affected Products
Vendor: OpenCTI-Platform
Product: opencti
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.05% (probability of being exploited)
EPSS Percentile: 16.74% (scored less or equal to compared to others)
EPSS Date: 2025-06-16 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-26621https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-gq63-jm3h-374p
https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-mf88-g2wq-p7qm