CVE-2025-26621

OpenCTI vulnerable to Denial of Service through web hook

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.

Category

7.6
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.06%
Affected: OpenCTI-Platform opencti
Published at:
Updated at:

References

Link Tags
https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-gq63-jm3h-374p
https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-mf88-g2wq-p7qm

Frequently Asked Questions

What is the severity of CVE-2025-26621?
CVE-2025-26621 has been scored as a high severity vulnerability.
How to fix CVE-2025-26621?
To fix CVE-2025-26621, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-26621 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-26621 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-26621?
CVE-2025-26621 affects OpenCTI-Platform opencti.
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