CVE-2025-59838

Monkeytype Vulnerable to Self-XSS on loading saved custom text

MEDIUM
5.4
CVSS Score
Published: September 25, 2025 at 02:52 PM UTC
Updated: October 14, 2026 at 08:15 PM UTC
2 products affected across 2 vendorsMonkeytypeMonkeytype

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.3%
SSVC
PoC

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 patched via commit f025b12.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 25.44.0
Affected range stops below 25.44.0, so it looks safe — our inference, not a vendor statement

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-79

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