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.

• CWE-79

• https://blog.mozilla.org/security/2016/08/26/mitigating-mime-confusion-attacks-in-firefox/Third Party Advisory
• https://github.com/V1n1v131r4/MIME-Confusion-Attack-on-Midori-Browser/blob/master/README.mdExploit, Third Party Advisory
• https://portswigger.net/research/bypassing-csp-using-polyglot-jpegsExploit, Third Party Advisory
• https://blog.mozilla.org/security/2016/08/26/mitigating-mime-confusion-attacks-in-firefox/Third Party Advisory
• https://github.com/V1n1v131r4/MIME-Confusion-Attack-on-Midori-Browser/blob/master/README.mdExploit, Third Party Advisory
• https://portswigger.net/research/bypassing-csp-using-polyglot-jpegsExploit, Third Party Advisory

Published

Dec 20, 2019

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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