CVE-2021-23968
MEDIUMFirefox < 86.0, Firefox ESR < 78.8, Thunderbird < 78.8 - Information Disclosure via CSP Violation Report
Title source: llmDescription
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.
References (8)
Core 8
Core References
Release Notes, Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2021-07/
Release Notes, Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2021-09/
Release Notes, Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2021-08/
Issue Tracking, Permissions Required, Vendor Advisory x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1687342
Mailing List, Third Party Advisory mailing-list
x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2021/03/msg00000.html
Third Party Advisory vendor-advisory
x_refsource_debian
https://www.debian.org/security/2021/dsa-4866
Third Party Advisory vendor-advisory
x_refsource_gentoo
https://security.gentoo.org/glsa/202104-10
Third Party Advisory vendor-advisory
x_refsource_gentoo
https://security.gentoo.org/glsa/202104-09
Scores
CVSS v3
4.3
EPSS
0.0027
EPSS Percentile
50.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Details
CWE
CWE-209
Status
published
Products (5)
debian/debian_linux
9.0
debian/debian_linux
10.0
mozilla/firefox
< 86.0
mozilla/firefox_esr
< 78.8
mozilla/thunderbird
< 78.8
Published
Feb 26, 2021
Tracked Since
Feb 18, 2026