Medium severity · published Sep 25, 2025
CVE-2025-59838
Monkeytype Vulnerable to Self-XSS on loading saved custom text
5.4
CVSS
0.3%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 17% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MO
monkeytype · monkeytypegame
< 25.44.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-59838
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-59838
x_refsource_CONFIRM
https://github.com/monkeytypegame/monkeytype/security/advisories/GHSA-j4xx-fww5-774w
x_refsource_MISC
https://github.com/monkeytypegame/monkeytype/commit/42f6a16c6255d66cbb2be279131454866d98f2c9
x_refsource_MISC
https://github.com/monkeytypegame/monkeytype/commit/f025b121cbe437e29de432b4aa72e0de22c755b7
x_refsource_MISC
https://github.com/monkeytypegame/monkeytype/releases/tag/v25.44.0
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