CVE-2019-9803

EPSS 0.6%

Vexday Risk Score

3Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS —EPSS 0.6%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

26 Apr 2019Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

The Upgrade-Insecure-Requests (UIR) specification states that if UIR is enabled through Content Security Policy (CSP), navigation to a same-origin URL must be upgraded to HTTPS. Firefox will incorrectly navigate to an HTTP URL rather than perform the security upgrade requested by the CSP in some circumstances, allowing for potential man-in-the-middle attacks on the linked resources. This vulnerability affects Firefox < 66.

Affected products

Mozilla · Firefox

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References

https://bugzilla.mozilla.org/show_bug.cgi?id=1437009 https://bugzilla.mozilla.org/show_bug.cgi?id=1515863 https://w3c.github.io/webappsec-upgrade-insecure-requests/https://www.mozilla.org/security/advisories/mfsa2019-07/