CVE-2025-26621
6.8
MEDIUM
CVSS 3.1
EPSS 0.73%
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.
How to fix CVE-2025-26621
To remediate CVE-2025-26621, upgrade the affected package to a fixed version below.
- —upgrade to 6.5.2 or later
Is CVE-2025-26621 being exploited?
Low — EPSS is 0.7%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 6.5.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H |