This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8. This was fixed to be the redirect destination's origin. If that's not possible, user agents need to strip the URL down to an origin to avoid unintentional leakage." Under certain types of redirects, Firefox incorrectly set the source file to be the destination of the redirects. (CVE-2021-23968)Īs specified in the W3C Content Security Policy draft, when creating a violation report, "User agents need to ensure that the source file is the URL requested by the page, pre-redirects. This could be used to leak sensitive information contained in such URIs. If Content Security Policy blocked frame navigation, the full destination of a redirect served in the frame was reported in the violation report as opposed to the original frame URI.
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