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Description

Monkeytype is a minimalistic and customizable typing test. In 25.49.0 and earlier, there is improper handling of user input which allows an attacker to execute malicious javascript on anyone viewing a malicious quote submission. quote.text and quote.source are user input, and they're inserted straight into the DOM. If they contain HTML tags, they will be rendered (after some escaping using quotes and textarea tags).

PUBLISHED Reserved 2025-12-04 | Published 2025-12-04 | Updated 2025-12-04 | Assigner GitHub_M




HIGH: 7.1CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

<= 25.49.0
affected

References

github.com/...eytype/security/advisories/GHSA-mfjh-9552-8g27

github.com/...ommit/d6d062a77132ba7d6ba3b482d46ae329d3b8d695

cve.org (CVE-2025-66563)

nvd.nist.gov (CVE-2025-66563)

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