VIR Vulnerability Intelligence Relay

CVE-2025-26621

unknown
Published 2025-05-19 · Modified 2026-05-20
CVSS v3
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CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
CVSS v2
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VIR risk
—

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.

Predictions

Exploit likelihood
30%
Patch ETA
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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No vendor mitigations ingested yet for this CVE. The mitigation-content worker queues fetches as references arrive — check back in a few minutes, or see the references list below.

Package impact
EcosystemPackageVulnerableFixed
python PyPIpycti<6.5.26.5.2

References

Verify integrity in audit chain (admin only). AS-IS.