CVE-2026-66636: Marcin Wise Chat

Medium severity, CVSS 6.5. EPSS: 0.2% chance of exploitation in the next 30 days.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Marcin Wise Chat wise-chat allows Stored XSS.This issue affects Wise Chat: from n/a through 3.4.3.

Affected products

• Marcin Wise Chat: up to and including 3.4.3

Published 2026-08-18. Last modified 2026-10-07.