CVE-2021-37700

MEDIUM

@github/paste-markdown < 0.3.4 - Stored Cross-Site Scripting via Clipboard Table Element Handling

Title source: llm
STIX 2.1

Description

@github/paste-markdown is an npm package for pasting markdown objects. A self Cross-Site Scripting vulnerability exists in the @github/paste-markdown before version 0.3.4. If the clipboard data contains the string `<table>`, a **div** is dynamically created, and the clipboard content is copied into its **innerHTML** property without any sanitization, resulting in improper execution of JavaScript in the browser of the victim (the user who pasted the code). Users directed to copy text from a malicious website and paste it into pages that utilize this library are affected. This is fixed in version 0.3.4. Refer the to the referenced GitHub Advisory for more details including an example exploit.

References (4)

Core 4

Scores

CVSS v3 6.5
EPSS 0.0166
EPSS Percentile 73.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Details

CWE
CWE-79
Status published
Products (2)
github/paste-markdown 0 - 0.3.4npm
paste-markdown_project/paste-markdown < 0.3.4
Published Aug 12, 2021
Tracked Since Feb 18, 2026