Vulnerability · Published Mar 12, 2026 · Assigned by GitHub_M
CVE-2026-21887OpenCTI has a Semi-Blind SSRF via Unvalidated External URL in Data Ingestion Feature
High 7.7
In plain English
A high-severity server-side request forgery in opencti from OpenCTI-Platform. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Prior to 6.8.16, the OpenCTI platform’s data ingestion feature accepts user-supplied URLs without validation and uses the Axios HTTP client with its default configuration (allowAbsoluteUrls: true). This allows attackers to craft requests to arbitrary endpoints, including internal services, because Axios will accept and process absolute URLs. This results in a semi-blind SSRF, as responses may not be fully visible but can still impact internal systems. This vulnerability is fixed in 6.8.16.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | pycti | 6.8.16 | GHSA-ffm6-vvph-g5f5 |
| PyPI | pycti | 6.8.16 | PYSEC-2026-118 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| OpenCTI-Platform | opencti | < 6.8.16 |
Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N