CVE-2019-19916

Name: CVE-2019-19916
Creator: NVD / NIST
Published: 2019-12-20T16:15:12.233+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 1.57%

Last modified Jun 17, 2026

CVE-2019-19916 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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. EPSS estimates a 1.57% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

1.57%

72.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Midori-Browser	Midori	0.5.11

References

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

Timeline

Published: Dec 20, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-19916?

How severe is CVE-2019-19916?

CVE-2019-19916 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.57% probability of exploitation in the next 30 days.

How do I fix CVE-2019-19916?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-19916?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST