🛡️ CVE-2026-21887
🟠 CVSS 7.7 — High ✅ No Known Exploit CWE-918 NVD
7.7
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity HIGH
CVSS Score 7.7
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
CWE CWE-918
Public Exploit ✅ No
Source NVD
Published 2026-03-12
Updated 2026-06-02
Modified 2026-03-19
Fix URL N/A

Affected Packages

Software From version Fixed in
opencti — 6.8.16
pycti — 6.8.16

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