Not rated
CVE-2021-23969 As specified in the W3C Content Security Policy draft, when creating a violation report, "User agents need to ensure…
Description
As 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. 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. This was fixed to be the redirect destination's origin. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Firefox 86 | earliest → < 86 | 86 |
| Thunderbird 78.8 | earliest → < 78.8 | 78.8 |
| Firefox ESR 78.8 | earliest → < 78.8 | 78.8 |
Other CVEs of Firefox
The 2221 CVEs of Firefox →
CVE-2026-120572
Incorrect boundary conditions in the Layout: Block and Inline component
8.8
High
CVE-2026-118027
Frame poisoning in the Layout component
9.1
Critical
CVE-2026-118024
Use-after-free in the Graphics: Text component
8.8
High
CVE-2026-118026
Invalid pointer in the JavaScript: GC component
8.8
High