CVE-2021-23968
Mozilla: Content Security Policy violation report could have contained the destination of a redirect
Severity
ImportantRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · February 23, 2021
Updated · November 22, 2025
Description
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. This could be used to leak sensitive information contained in such URIs. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 4.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor