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Vulnerabilities

Threat intelligence · CVE-2025-26621

OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables.

Published May 19, 2025 · catalog updated May 19, 2025 · OpenCTI-Platform

Check this week

CVE-2025-26621 is not in CISA KEV. FIRST estimates a 42.00% chance of exploitation in the next 30 days. Check whether you run OpenCTI-Platform.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.6
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
42.00%
Remediation
Version ranges on file
Affected products
vendor OpenCTI-Platform opencti < 6.5.2

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor OpenCTI-Platform opencti < 6.5.2< 6.5.2

How to fix CVE-2025-26621

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-26621 is not in CISA KEV. FIRST estimates a 42.00% chance of exploitation in the next 30 days. Check whether you run OpenCTI-Platform.

Which versions are affected?

Compare what you have installed with OpenCTI-Platform opencti < 6.5.2 < 6.5.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 42.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 19, 2025 · EUVD

    Detected

    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 fixe

  2. May 19, 2025 · EUVD

    Updated

    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 fixe

Sources

  • CVE.orgVulnerability recordCVE-2025-26621

    Official CVE identifier

    cve.org
  • EUVDVulnerability recordEUVD-2025-15725

    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 atta

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog May 19, 2025. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.