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CVE-2021-38503

CVE-2021-38503

EPSS 3.8%
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 products
Mozilla · FirefoxMozilla · Firefox ESRMozilla · Thunderbird

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References
https://bugzilla.mozilla.org/show_bug.cgi?id=1729517https://lists.debian.org/debian-lts-announce/2021/12/msg00030.htmlhttps://lists.debian.org/debian-lts-announce/2022/01/msg00001.htmlhttps://security.gentoo.org/glsa/202202-03https://security.gentoo.org/glsa/202208-14https://www.debian.org/security/2021/dsa-5026https://www.debian.org/security/2022/dsa-5034https://www.mozilla.org/security/advisories/mfsa2021-48/https://www.mozilla.org/security/advisories/mfsa2021-49/https://www.mozilla.org/security/advisories/mfsa2021-50/