CVE-2019-18893: Avast Secure Browser

Medium severity, CVSS 6.1. EPSS: 1.8% chance of exploitation in the next 30 days.

XSS in the Video Downloader component before 1.5 of Avast Secure Browser 77.1.1831.91 and AVG Secure Browser 77.0.1790.77 allows websites to execute their code in the context of this component. While Video Downloader is technically a browser extension, it is granted a very wide set of privileges and can for example access cookies and browsing history, spy on the user while they are surfing the web, and alter their surfing experience in almost arbitrary ways.

Affected products

• Avast Secure Browser: version 77.1.1831.91 only
• Avg Secure Browser: version 77.0.1790.77 only
• Video Downloader Project Video Downloader: before 1.5 (fixed in 1.5)

Published 2020-01-13. Last modified 2026-06-17.