CVE•Published 2026-08-18•Modified 2026-09-01•1 article on news•4 live references•NVD data
CVE-2026-75874Mozilla · Firefox
Vulnerability data via NVD (ingested)
CVSS v3.1
10.0
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS percentile
33
Exploit Prediction Scoring System · top 67% of all CVEs
Weaknesses (CWE)
Description
Sandbox escape in the Remote Settings Client component. This vulnerability was fixed in Firefox 154, Thunderbird 154, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 140.15, and Thunderbird 153.2.
Timeline
Published 2026-08-18
Modified 2026-09-01
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-2026-75874Hosts 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-2026-75874Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-75874Censys host search filtered to this CVE id.
grep.app
CVE-2026-75874Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-75874GitHub code search for direct mentions.
Google dork
"CVE-2026-75874" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-75874 on GitHub.