Is this vulnerability remotely exploitable over the internet?

Yes, if an attacker can access the data ingestion feature or any endpoint that accepts user-controlled URLs, they can exploit the SSRF remotely. The extent of what can be reached depends on the OpenCTI server's network connectivity and surrounding controls.

Does exploitation require authentication or special privileges?

It depends on how OpenCTI is deployed. If only authenticated users can configure or submit ingestion URLs, the attacker must first obtain such access. In more permissive setups or where integrations expose this endpoint indirectly, the barrier may be lower.

What is the safest general fix pattern for developers?

Restrict outbound requests to a small set of explicitly allowed destinations, validate and normalize URLs before any network call, and block known-sensitive address ranges at both the application and network layers. Treat all user-supplied URLs as untrusted, regardless of user role.

Severity:

HIGH RISK

(7.7)

Server-Side Request Forgery (CWE-918) in OpenCTI Data Ingestion URLs

CVE-2026-21887

Published:

Mar 12, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-918

HIGH RISK

HIGH

(8.6)

Server-Side Request Forgery (CWE-918) in OpenClaw Zalo Plugin sendPhoto

Unauthorized Access to Internal Resources via SSRF

May 6, 2026

CWE-863

HIGH RISK

HIGH

(8.8)

Authorization Bypass (CWE-863) in OpenClaw Matrix Room Control Commands

Privilege Escalation via Bypassed Access Control

May 6, 2026

Vulnerability Type

Category:

Server-Side Request Forgery (SSRF)

CWE:

CWE-918

Impact:

Semi-Blind SSRF to Internal and External HTTP Endpoints

Severity:

HIGH RISK

(7.7)

CVSS Version:

3.1

Vulnerability Type

Category:

Server-Side Request Forgery (SSRF)

CWE:

CWE-918

Impact:

Semi-Blind SSRF to Internal and External HTTP Endpoints

Severity:

HIGH RISK

(7.7)

CVSS Version:

3.1

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Server-Side Request Forgery (CWE-918) in OpenCTI Data Ingestion URLs

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.6)

Server-Side Request Forgery (CWE-918) in OpenClaw Zalo Plugin sendPhoto

HIGH RISK

HIGH

(8.8)

Authorization Bypass (CWE-863) in OpenClaw Matrix Room Control Commands

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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