4.7

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-9910

CVE-2025-9910: jsondiffpatch is vulnerable to Cross-site Scripting (XSS) via HtmlFormatter::nodeBegin

Versions of the package jsondiffpatch before 0.7.2 are vulnerable to Cross-site Scripting (XSS) via HtmlFormatter::nodeBegin. An attacker can inject malicious scripts into HTML payloads that may lead to code execution if untrusted payloads were used as source for the diff, and the result renderer using the built-in html formatter on a private website.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2025-9910

CVE-2025-9910:

4.7

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
jsondiffpatch	npm	< 0.7.2	0.7.2

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability lies in the HTML formatter of the jsondiffpatch library. The analysis of the provided patch 0e374b5dd8d7879b329a9fc18affbd46ad50dd14 reveals that two functions, HtmlFormatter.nodeBegin and HtmlFormatter.typeFormattterErrorFormatter, were rendering raw, unescaped data into the generated HTML diff. Specifically, HtmlFormatter.nodeBegin was using the object key (leftKey) without escaping, and HtmlFormatter.typeFormattterErrorFormatter was rendering the error message (err) without escaping. An attacker could craft a malicious JSON object with script tags in the keys or trigger an error with a malicious message. When the diff is generated in HTML format, these scripts would be executed in the user's browser. The patch mitigates this by introducing an htmlEscape function that sanitizes the leftKey and the error message before they are included in the HTML output, thus preventing the XSS vulnerability.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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