CVE-2019-19916
CVE-2019-19916 is a medium-severity vulnerability in Midori-browser Midori with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.
Key facts
- Severity: Medium (CVSS 3.x base score 6.1)
- CVSS v2: 4.3
- EPSS exploit prediction: 2% (72nd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-79
- Affected product: Midori-browser Midori
- Published:
- Last modified:
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.
Frequently asked questions
- What is 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.
- How severe is CVE-2019-19916?
- CVE-2019-19916 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
- Is CVE-2019-19916 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2019-19916?
- CVE-2019-19916 affects Midori-browser Midori. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2019-19916?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2019-19916 published?
- CVE-2019-19916 was published on 2019-12-20 and last updated on 2026-06-17.
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
Affected products (1)
- cpe:2.3:a:midori-browser:midori:0.5.11:*:*:*:*:*:*:*
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