5.4

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-40201

CVE-2026-40201: @diplodoc/search-extension allows stored XSS via Markdown file title

@diplodoc/search-extension 1.0.0 through 3.0.2 allows stored XSS via .md file title.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2026-40201

CVE-2026-40201:

5.4

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
@diplodoc/search-extension	npm	>= 1.0.0, < 3.0.5	3.0.5

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability is a stored Cross-Site Scripting (XSS) issue in the @diplodoc/search-extension package. The root cause lies in the highlighte function within src/worker/format.ts. This function is responsible for wrapping search result text in HTML <span> tags for highlighting. The vulnerability existed because the input text, which could be a user-controlled markdown file title, was not sanitized before being embedded in the HTML output. An attacker could create a markdown file with a malicious title containing a script. When a user's search query matches this file, the format function is called, which in turn calls highlighte. The highlighte function would then generate HTML containing the malicious script, which would be executed in the user's browser. The patch addresses this by introducing a new escapeHTML function and modifying highlighte to use it, ensuring that any special HTML characters in the input are properly escaped before being rendered.

Vulnerable functions

highlighte

src/worker/format.ts

The `highlighte` function was vulnerable to XSS because it directly embedded content from search results into an HTML string without proper sanitization. An attacker could craft a malicious markdown file title containing an XSS payload, which would then be rendered and executed in the browser of a user viewing the search results.

format

src/worker/format.ts

The `format` function is the exported function that orchestrates the formatting of search results. It calls the vulnerable `highlighte` function, passing it the potentially malicious text from the search result. As the entry point for the vulnerable operation, it would appear in any runtime profile during exploitation.

Vulnerability Intelligence
Miggo AI

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WAF Protection Rules

WAF Rule

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Reasoning

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