CVEvulnerability
CVE-2021-38503
10.0 CRITICAL
Official page ↗
- Status
- Modified
- Published
- 2021-12-08
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 10.0 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- CVSS 2.0 ([email protected])
- 7.5 HIGH — AV:N/AC:L/Au:N/C:P/I:P/A:P
- Weaknesses
- CWE-863
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.
Affected configurations
• mozilla firefox (< 94.0)
• mozilla firefox esr (< 91.3)
• mozilla thunderbird (< 91.3)
• debian debian linux 9.0
• debian debian linux 10.0
• debian debian linux 11.0
Related
Weakness · CWE (1)
- CWE-863 Incorrect Authorization weakness
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1729517 Issue Tracking, Permissions Required, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html Mailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202202-03 Third Party Advisory
- https://security.gentoo.org/glsa/202208-14 Third Party Advisory
- https://www.debian.org/security/2021/dsa-5026 Third Party Advisory
- https://www.debian.org/security/2022/dsa-5034 Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-48/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-49/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-50/ Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1729517 Issue Tracking, Permissions Required, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html Mailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202202-03 Third Party Advisory
- https://security.gentoo.org/glsa/202208-14 Third Party Advisory
- https://www.debian.org/security/2021/dsa-5026 Third Party Advisory
- https://www.debian.org/security/2022/dsa-5034 Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-48/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-49/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-50/ Vendor Advisory