8.1

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2020-8134

CVE-2020-8134: Server-side request forgery in Ghost CMS

Server-side request forgery (SSRF) vulnerability in Ghost CMS < 3.10.0 allows an attacker to scan local or external network or otherwise interact with internal systems.

(GitHub Advisory)

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CVE-2020-8134

CVE-2020-8134:

8.1

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
ghost	npm	< 3.10.0	3.10.0

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability exists in the oembed endpoint's URL processing chain. The primary vulnerable function is fetchOembedData which handled user-provided URLs and made network requests without adequate validation of target hosts (IP/localhost checks added in patch). The removed getOembedUrlFromHTML function contributed to the vulnerability by extracting URLs from untrusted HTML content that were then used in requests. The patch adds multiple security layers: 1) isIpOrLocalhost validation for initial URLs and embedded oembed links 2) Response validation against oembed spec 3) Removal of direct HTML parsing via getOembedUrlFromHTML. During exploitation, the call stack would show fetchOembedData processing malicious URLs either directly provided or extracted from HTML content.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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