CVE-2019-19916: In Midori Browser 0.5.11 (on Windows 10), Content Security Policy (CSP) is not applied correctly to all parts

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MEDIUM 6.1DOWNGRADE

CVE-2019-19916 is a medium-severity flaw (CVSS 6.1) affecting midori. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 G

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.6% (top 25%)
CISA exploited list	No
Weakness	CWE-79
Published	2019-12-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: midori-browser

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-12-20 16:15 UTCPublished CVE record published
2026-06-17 02:27 UTCUpdated Record last modified

midori-browser midori DOWNGRADE

Affected: 0.5.11

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.5.11

1. Check installed version

apt-cache policy midori || rpm -q midori || midori --version

2. No fixed release: DOWNGRADE to a release before 0.5.11 (Debian / Ubuntu)

apt-cache madison midori sudo apt install midori=<VERSION_BEFORE_0.5.11> sudo apt-mark hold midori

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list midori sudo dnf downgrade midori-<VERSION_BEFORE_0.5.11> sudo dnf versionlock add midori

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-19916?

midori: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-19916 being exploited?

CVE-2019-19916 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-19916 affect?

CVE-2019-19916 affects midori. Severity is medium (CVSS 6.1). 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

How urgent is CVE-2019-19916?

Priority 45/100. Public exploit reference

Software pages

Windows vulnerabilities

References

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