High severity7.6NVD Advisory· Published May 19, 2025· Updated Jun 17, 2026
CVE-2025-26621
CVE-2025-26621
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
3cpe:2.3:a:citeum:opencti:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:citeum:opencti:*:*:*:*:*:*:*:*range: <6.5.2
- (no CPE)range: < 6.5.2
Patches
Vulnerability mechanics
References
2News mentions
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