CVE-2021-23969

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…

published February 26, 2021

CVSS
—
EPSS
1%
Percentile
68.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.01212 · 68.3th percentile
Published
2021-02-26T01:57Z
EPSS history
Timeline
  • 26 FEB 01:57Z
    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…
    cvelistv5