CVE•Published 2026-05-12•Modified 2026-05-19•1 article on news•6 live references•NVD data
CVE-2026-8401Mozilla · Firefox
Vulnerability data via NVD (ingested)
CVSS v3.1
9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS percentile
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Weaknesses (CWE)
Description
Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.
Timeline
Published 2026-05-12
Modified 2026-05-19
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-8401Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Mozilla Firefox"All exposed Mozilla Firefox instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Firefox"HTTP body or banner mentions "Firefox" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-8401Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-8401Censys host search filtered to this CVE id.
grep.app
CVE-2026-8401Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-8401GitHub code search for direct mentions.
Google dork
"CVE-2026-8401" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.