CVE-2019-19916

MEDIUM 6.1CVE-2019-19916 · Published 20/12/2019 · updated 17/06/2026

In short

CVE-2019-19916 is a MEDIUM (CVSS 6.1) vulnerability affecting midori (midori-browser).
Chance of exploitation in the next 30 days (EPSS): 1.6%, higher than 75.5% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
midori midori-browser	`= 0.5.11`	No fix yet

Description

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.

References

blog.mozilla.org/security/2016/08/26/mitigating-mime-confusion-attacks-in-firefox · Third Party Advisory
V1n1v131r4/MIME-Confusion-Attack-on-Midori-Browser · Exploit
portswigger.net/research/bypassing-csp-using-polyglot-jpegs · Exploit

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