{"id":"CVE-2026-40372","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-40372","generatedAt":"2026-10-31T05:59:04.216Z","title":"Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.","description":"Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.","published":"2026-04-21T20:16:59.000Z","lastModified":"2026-10-26T21:10:00.000Z","status":"Modified","sourceIdentifier":"secure@microsoft.com","cvss":{"version":"3.1","score":9.1,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"},"cwe":["CWE-347"],"affected":["microsoft/asp.net core"],"epss":{"score":0.11205,"percentile":0.9595,"date":"2026-10-30","history":[{"date":"2026-09-24","score":0.00824,"percentile":0.55507},{"date":"2026-10-25","score":0.11205,"percentile":0.95927}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 11.2%, higher than 96% of all known CVEs. Patch or mitigate before the next change window."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-10-25T00:00:00.000Z","detail":{"to":0.11205,"from":0.00824,"percentile":0.95927},"summary":"EPSS moved from 0.8% to 11.2% probability of exploitation in the next thirty days."}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40372","tags":["Vendor Advisory"],"source":"secure@microsoft.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-40372","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2460224","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40372.json","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-40372","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}