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    CVE-2025-66563

    Monkeytype is a minimalistic and customizable typing test. In 25.49.0 and earlier, there is improper handling of user input which allows an attacker to execute malicious javascript on anyone viewing a malicious quote submission. quote.text and quote.source are user input, and they're inserted straight into the DOM. If they contain HTML tags, they will be rendered (after some escaping using quotes and textarea tags).

    Published:Dec 4, 2025
    Last Modified:Dec 17, 2025
    EPS:Dec 4, 2025
    EPSS Score:0.00062
    CVSS Score:6.1

    Affected Products

    Vendor
    Monkeytype
    Product
    Monkeytype

    Exploits

    https://github.com/monkeytypegame/monkeytype/security/advisories/GHSA-mfjh-9552-8g27https://github.com/monkeytypegame/monkeytype/security/advisories/GHSA-mfjh-9552-8g27

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High