XSS in Microsoft Windows 10
CVE-2019-19916
In Midori Browser 0.5.11 (on Windows 10), Content Security Policy (CSP) is not applied correctly to all parts of multipart content sent with the multipart/x-mixed-replace MIME type. This could result in script running where CSP should have blocked it, allowing for cross-site scripting (XSS) and other attacks when the product renders the content as HTML. Remediating this would also need to consider the polyglot case, e.g., a file that is a valid GIF image and also valid JavaScript.
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: 0.016 (75.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 75.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000
Affected products
- Microsoft Windows 10
- Midori-Browser Midori — versions 0.5.11
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/V1n1v131r4/MIME-Confusion-Attack-on-Midori-Browser/blob/master/READM… (Exploit, Third Party Advisory)
- blog.mozilla.org/security/2016/08/26/mitigating-mime-confusion-attacks-in-firef… (Third Party Advisory)
- portswigger.net/research/bypassing-csp-using-polyglot-jpegs (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-19916?
- CVE-2019-19916 is a medium-severity vulnerability in Microsoft Windows 10, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-12-20.
- How severe is CVE-2019-19916?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2019-19916 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.