XSS in Monkeytype
CVE-2025-59838
Monkeytype is a minimalistic and customizable typing test. In versions 25.36.0 and prior, improper handling of user input when loading a saved custom text results in XSS. This issue has been fixed in version 25.44.0.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.002 (12.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
Affected products
- Monkeytype
- Monkeytypegame Monkeytype — versions < 25.44.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-59838?
- CVE-2025-59838 is a medium-severity vulnerability in Monkeytype, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2025-09-25.
- How severe is CVE-2025-59838?
- Medium severity. CVSS v3 base score is 5.4 out of 10.
- Is CVE-2025-59838 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.