CVE•Published 2026-07-21•Modified 2026-07-22•1 article on news•5 live references•NVD data

CVE-2026-16394Mozilla · Firefox

Vulnerability data via NVD (ingested)

CVSS v3.1

9.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS percentile

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Weaknesses (CWE)

CWE-693Protection Mechanism Failure

Description

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Timeline

Published 2026-07-21

Modified 2026-07-22

External references

NVD MITRE Exploit-DB GitHub PoC VulnCheck

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-2026-16394

Hosts 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-2026-16394

Country / ASN / product breakdown for the vuln query.

Censys

vulnerabilities.cve_id: CVE-2026-16394

Censys host search filtered to this CVE id.

grep.app

CVE-2026-16394

Public source-code mentions — fast PoC discovery.

GitHub code

CVE-2026-16394

GitHub code search for direct mentions.

Google dork

"CVE-2026-16394" exploit -site:nvd.nist.gov

Write-ups and news, NVD excluded.

Known PoCs on GitHub (4)

CVE-2026-163944 repos

mooyoul/awesome-starsunknown

A curated list of my GitHub stars

★ 21·updated today

Nsbx/awesome-starsunknown

My Awesome List generated by : https://github.com/abhijithvijayan/stargazed

★ 11·updated today

liuzhen9320/zstarunknown

They said organizing stars was extremely troublesome, so I lent a hand.

★ 7·updated 1d ago

jaschadub/compromised-packages-checkPython

Scan a repository for known-malicious npm, cratres, and PyPI package versions from recent supply-chain compromises (Mini Shai-Hulud, TanStack, @cap-js/mbt, etc). UPDATED 6 TIMES A …

★ 1·updated today