XSS in Avast Secure Browser
CVE-2019-18893
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.018 (77.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000
Affected products
- Avast Secure Browser — versions 77.1.1831.91
- Avg Secure Browser — versions 77.0.1790.77
- Video Downloader Project
Weakness classification (CWE)
References
- palant.de/2020/01/13/pwning-avast-secure-browser-for-fun-and-profit/ (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-18893?
- CVE-2019-18893 is a medium-severity vulnerability in Avast Secure Browser, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-01-13.
- How severe is CVE-2019-18893?
- Medium severity. CVSS v3 base score is 6.1 out of 10.