VDB
GHSA-6g99-7xcp-vcw9
GHSA-6g99-7xcp-vcw9
PUBLISHED
CVSS 10 CRITICAL
Record from GitHub Advisory Database · Published December 9, 2021
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.
Risk scores
CVSS 3.1
10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Timeline
- Dec 9, 2021 CVE Published
- Apr 9, 2026 Distribution Patch (2 in total, the first dated here)
- Apr 29, 2026 Security Advisory
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln GHSA-6g99-7xcp-vcw9
vulnetix vdb fixes GHSA-6g99-7xcp-vcw9Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/GHSA-6g99-7xcp-vcw9/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart
References
- https://security.gentoo.org/glsa/202208-14 url
- https://www.mozilla.org/security/advisories/mfsa2021-48 url
- https://bugzilla.mozilla.org/show_bug.cgi?id=1729517 url
- https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html url
- https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html url
- https://www.debian.org/security/2022/dsa-5034 url
- https://www.mozilla.org/security/advisories/mfsa2021-49 url
- https://www.mozilla.org/security/advisories/mfsa2021-50 url
- https://nvd.nist.gov/vuln/detail/CVE-2021-38503 advisory
- https://security.gentoo.org/glsa/202202-03 url
- https://www.debian.org/security/2021/dsa-5026 url