CVE-2021-38503

critical

Description

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.

References

Advisories
More

https://www.debian.org/security/2022/dsa-5034

https://www.debian.org/security/2021/dsa-5026

https://security.gentoo.org/glsa/202208-14

https://security.gentoo.org/glsa/202202-03

https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html

https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html

https://www.mozilla.org/security/advisories/mfsa2021-50/

https://www.mozilla.org/security/advisories/mfsa2021-49/

https://www.mozilla.org/security/advisories/mfsa2021-48/

https://bugzilla.mozilla.org/show_bug.cgi?id=1729517

Details

Source: Mitre, NVD

Published: 2021-12-08

Updated: 2022-12-09

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 10

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.01026