What is CVE-2025-26621?

CVE-2025-26621 is a high-severity vulnerability in Citeum Opencti, classified under Code Injection. CVSS score: 7.6/10. Published 2025-05-19.

How severe is CVE-2025-26621?

High severity. CVSS v3 base score is 7.6 out of 10.

RCE in Citeum Opencti

CVE-2025-26621

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…

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.004 (27.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:H.

Affected products

Citeum Opencti
Opencti-platform Opencti — versions < 6.5.2

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (x_refsource_MISC, Not Applicable)

Frequently asked questions

What is CVE-2025-26621?: CVE-2025-26621 is a high-severity vulnerability in Citeum Opencti, classified under Code Injection. CVSS score: 7.6/10. Published 2025-05-19.
How severe is CVE-2025-26621?: High severity. CVSS v3 base score is 7.6 out of 10.