CVE-2021-38503
CRITICAL severity · CVSS 10 · Incorrect authorization
10CVSS CRITICAL
Summary
The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass restrictions such as executing scripts or navigating the top-level frame. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)4%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Additional information
- NVD record
- https://bugzilla.mozilla.org/show_bug.cgi?id=1729517Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-48/Advisory
- https://lists.debian.org/debian-lts-announce/2021/12/msg00030.htmlAdvisory
- https://lists.debian.org/debian-lts-announce/2022/01/msg00001.htmlAdvisory
- https://security.gentoo.org/glsa/202202-03Advisory
- https://security.gentoo.org/glsa/202208-14Advisory
- https://www.debian.org/security/2021/dsa-5026Advisory
- https://www.debian.org/security/2022/dsa-5034Advisory