What’s Vulnerable › Vulnerabilities

CVE-2019-19916

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-12-20 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• Midori-Browser Midori: 0.5.11

References

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

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