Paper/Archive/CVE-2021-38503

CVE-2021-38503

Mozilla Firefox — The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass restrictions such as executing scri…

EPSS 4%CVSS 10.0

critical.is priorityof 100

CVSS 10.0 (NVD)10.0 / 10 × 3030.0 Not in CISA KEV+300.0 EPSS percentile 90.8.908 × 2018.2 No public exploit+100.0 SSVC exploitation: unknown+100.0

Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource

Firefoxunspecified – < 9494CNA

Thunderbirdunspecified – < 91.391.3CNA

Firefox ESRunspecified – < 91.391.3CNA

Scores by source

NVD10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References

refmozilla.org/security/advisories/mfsa2021-49 refmozilla.org/security/advisories/mfsa2021-50 refmozilla.org/security/advisories/mfsa2021-48 refbugzilla.mozilla.org/show_bug.cgi?id=1729517 advisorydebian.org/security/2021/dsa-5026 reflists.debian.org/debian-lts-announce/2021/12/msg00030.html advisorydebian.org/security/2022/dsa-5034 reflists.debian.org/debian-lts-announce/2022/01/msg00001.html advisorysecurity.gentoo.org/glsa/202202-03 advisorysecurity.gentoo.org/glsa/202208-14