CVE•Published 2026-09-01•Modified 2026-09-03•1 article on news•5 live references•NVD data
CVE-2026-84637Mozilla · Thunderbird
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
5
Exploit Prediction Scoring System · top 95% of all CVEs
Weaknesses (CWE)
Description
Malicious calendar invitations could use file URI attachments to launch local or network-hosted executables on Windows, bypassing Thunderbird's normal executable attachment protections. With the new invitation display enabled, the attachment could also appear under a misleading filename. This vulnerability was fixed in Thunderbird 154 and Thunderbird 153.2.
Timeline
Published 2026-09-01
Modified 2026-09-03
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-2026-84637Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Mozilla Thunderbird"All exposed Mozilla Thunderbird instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Thunderbird"HTTP body or banner mentions "Thunderbird" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-84637Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-84637Censys host search filtered to this CVE id.
grep.app
CVE-2026-84637Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-84637GitHub code search for direct mentions.
Google dork
"CVE-2026-84637" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-84637 on GitHub.