What’s Vulnerable › Vulnerabilities

CVE-2025-59838: Monkeytype Vulnerable to Self-XSS on loading saved custom text

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-09-25 · updated 2026-10-14
• Weakness: CWE-79

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.

Affected products

• monkeytypegame monkeytype: before 25.44.0 — fixed in 25.44.0

How to fix

Upgrade to a fixed version: monkeytypegame monkeytype 25.44.0. Check the vendor advisory for mitigations.

References

• https://github.com/monkeytypegame/monkeytype/commit/42f6a16c6255d66cbb2be279131454866d98f2c9
• https://github.com/monkeytypegame/monkeytype/commit/f025b121cbe437e29de432b4aa72e0de22c755b7
• https://github.com/monkeytypegame/monkeytype/releases/tag/v25.44.0
• https://github.com/monkeytypegame/monkeytype/security/advisories/GHSA-j4xx-fww5-774w
• https://github.com/monkeytypegame/monkeytype/security/advisories/GHSA-j4xx-fww5-774w

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