CVSS 3.1
6.8 mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:HCVE-2025-26621
Medium (6.8) in citeum opencti. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in pycti 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.
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 36% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-1321, CWE-94
- Published
- Modified
- Record from
- the NVD, synced
Affected
- citeum:opencti
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| PYSEC-2025-180 | PyPI | pycti | <6.5.2 | 6.5.2 |