CVE•Published 2026-04-21•Modified 2026-06-27•1 article on news•6 live references•NVD data
CVE-2026-40372Microsoft · Asp.net_core
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
95
Exploit Prediction Scoring System · top 5% of all CVEs
Weaknesses (CWE)
Description
Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.
Timeline
Published 2026-04-21
Modified 2026-06-27
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-2026-40372Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Microsoft Asp.net Core"All exposed Microsoft Asp.net Core instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Asp.net Core"HTTP body or banner mentions "Asp.net Core" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-40372Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-40372Censys host search filtered to this CVE id.
grep.app
CVE-2026-40372Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-40372GitHub code search for direct mentions.
Google dork
"CVE-2026-40372" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-40372 on GitHub.