Vulnerability 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).
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Monkeytype | Monkeytype | <= 25.49.0 |
Related Weaknesses (CWE)
References
- https://github.com/monkeytypegame/monkeytype/commit/d6d062a77132ba7d6ba3b482d46aPatch
- https://github.com/monkeytypegame/monkeytype/security/advisories/GHSA-mfjh-9552-ExploitVendor Advisory
- https://github.com/monkeytypegame/monkeytype/security/advisories/GHSA-mfjh-9552-ExploitVendor Advisory
FAQ
What is CVE-2025-66563?
CVE-2025-66563 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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...
How severe is CVE-2025-66563?
CVE-2025-66563 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-66563?
Check the references section above for vendor advisories and patch information. Affected products include: Monkeytype Monkeytype.