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 before 66.0 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.
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 before 66.0 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.
https://www.mozilla.org/en-US/security/advisories/mfsa2019-07/#CVE-2019-9803 https://bugzilla.mozilla.org/show_bug.cgi?id=1515863 https://bugzilla.mozilla.org/show_bug.cgi?id=1437009 https://w3c.github.io/webappsec-upgrade-insecure-requests/
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