CVE-2025-26621: OpenCTI vulnerable to Denial of Service through web hook
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2025-26621?
CVE-2025-26621 has a high severity rating due to the potential for denial of service attacks.
How do I fix CVE-2025-26621?
To fix CVE-2025-26621, upgrade OpenCTI to version 6.5.2 or later.
Who is affected by CVE-2025-26621?
CVE-2025-26621 affects users of OpenCTI prior to version 6.5.2 with customization management capabilities.
What type of attack can be conducted with CVE-2025-26621?
CVE-2025-26621 can be exploited to execute JavaScript code, potentially leading to denial of service.
What platform does CVE-2025-26621 pertain to?
CVE-2025-26621 pertains to the OpenCTI platform used for cyber threat intelligence management.