CVE-2025-66563: monkeytype through 25.49.0 (inclusive), <= 25.49.0

CVE-2025-66563. CVSS 3.1 base score 6.1 (MEDIUM, NVD). EPSS 0.00239 (percentile 0.1392), scored 17-Oct-2026.

Affected technology

monkeytype · through 25.49.0 (inclusive)
monkeytype

monkeytype · <= 25.49.0
monkeytypegame

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · No privileges required · Passive user interaction

What an attacker can do

An attacker can 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. Vendor/CNA’s CVSS 4.0 assessment (base score 7.1/10) rates confidentiality impact as high; integrity impact as low; availability impact as none.

Published 18-Oct-2026 15:50 UTC

CWE: CWE-79
CCR priority: 24.5 /100 (P4)
CVSS 3.1: 6.1 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N · NVD
EPSS: 0.00239 · percentile 0.1392 · 2026-10-17
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-18 15:50:37.644431+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2025-66563.html