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Vulnerability record · CVE-2025-59838 · published 25 September 2025

CVE-2025-59838: Monkeytype cross-site scripting vulnerability

Monkeytype · Monkeytype

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.

2.4 CVSS 4.0 Low EPSS 0.23% · top 87.4% CWE-79 · Cross-site scripting
2.4CVSS 4.0 base score
0.23%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/monkeytypegame/monkeytype/commit/f025b121cbe437e29de432b4aa72e0de22c755b7 Patch
https://github.com/monkeytypegame/monkeytype/releases/tag/v25.44.0
https://github.com/monkeytypegame/monkeytype/security/advisories/GHSA-j4xx-fww5-774w ExploitVendor Advisory
https://github.com/monkeytypegame/monkeytype/security/advisories/GHSA-j4xx-fww5-774w ExploitVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-59838), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.