Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2019-9803

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 33.4%
CVSS Severity
CVSS v3 Score 7.4
CVSS v2 Score 5.8
Products affected by CVE-2019-9803


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