{"id":"CVE-2026-40372","state":"PUBLISHED","title":"ASP.NET Core Elevation of Privilege Vulnerability","description":"Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.","publishedAt":"2026-04-21T19:20:50.215Z","updatedAt":"2026-10-15T15:53:48.048Z","severity":{"score":9.1,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","source":"microsoft"},"assigner":"microsoft","products":["Microsoft ASP.NET Core 10.0","Microsoft Microsoft Visual Studio 2026 version 18.5"],"affected":[{"vendor":"Microsoft","product":"ASP.NET Core 10.0","versions":[{"version":"10.0","status":"affected","lessThan":"10.0.7","versionType":"custom"}]},{"vendor":"Microsoft","product":"Microsoft Visual Studio 2026 version 18.5","versions":[{"version":"18.5.0","status":"affected","lessThan":"18.5.2","versionType":"custom"}]}],"references":["https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40372","https://access.redhat.com/security/cve/CVE-2026-40372","https://bugzilla.redhat.com/show_bug.cgi?id=2460224","https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40372.json"],"weaknesses":["CWE-347"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/40xxx/CVE-2026-40372.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-40372","state":"PUBLISHED","datePublished":"2026-04-21T19:20:50.215Z","dateUpdated":"2026-10-15T15:53:48.048Z","assignerShortName":"microsoft","assignerOrgId":"f38d906d-7342-40ea-92c1-6c4a2c6478c8","dateReserved":"2026-04-11T23:06:15.615Z"},"containers":{"cna":{"title":"ASP.NET Core Elevation of Privilege Vulnerability","descriptions":[{"lang":"en-US","value":"Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network."}],"affected":[{"vendor":"Microsoft","product":"ASP.NET Core 10.0","versions":[{"version":"10.0","status":"affected","lessThan":"10.0.7","versionType":"custom"}]},{"vendor":"Microsoft","product":"Microsoft Visual Studio 2026 version 18.5","versions":[{"version":"18.5.0","status":"affected","lessThan":"18.5.2","versionType":"custom"}]}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40372","name":"ASP.NET Core Elevation of Privilege Vulnerability","tags":["vendor-advisory","patch"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en-US","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","baseSeverity":"CRITICAL","baseScore":9.1,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-347","description":"CWE-347: Improper Verification of Cryptographic Signature","lang":"en-US","type":"CWE"}]}],"providerMetadata":{"shortName":"microsoft","orgId":"f38d906d-7342-40ea-92c1-6c4a2c6478c8","dateUpdated":"2026-10-15T15:53:48.048Z"},"datePublic":"2026-04-21T14:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*","versionStartIncluding":"10.0","versionEndExcluding":"10.0.7"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:visual_studio_2026:*:*:*:*:*:*:*:*","versionStartIncluding":"18.5.0","versionEndExcluding":"18.5.2"}]}]}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-21T00:00:00+00:00","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3","id":"CVE-2026-40372"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-22T03:56:11.609Z"}},{"title":"ASP.NET Core: ASP.NET: ASP.NET Core: Privilege escalation via improper cryptographic signature verification","descriptions":[{"lang":"en","value":"A flaw was found in ASP.NET Core due to improper verification of cryptographic signatures. An unauthorized attacker can exploit this vulnerability remotely over a network, leading to privilege escalation."}],"affected":[{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","packageName":"dotnet10.0","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:10"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 8","packageName":"dotnet10.0","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:8"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","packageName":"dotnet10.0","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:9"]},{"vendor":"Red Hat","product":"Red Hat Hardened Images","packageName":"dotnet10.0","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:hummingbird:1"]}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-40372","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2460224","name":"RHBZ#2460224","tags":["issue-tracking","x_refsource_REDHAT"]},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40372.json","tags":["x_sadp-csaf-vex"]}],"metrics":[{"other":{"content":{"namespace":"https://access.redhat.com/security/updates/classification/","value":"Critical"},"type":"Red Hat severity rating"}},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-347","description":"Improper Verification of Cryptographic Signature","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"redhat-SADP","orgId":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","dateUpdated":"2026-07-15T02:45:28.657Z"},"datePublic":"2026-04-21T19:20:50.215Z","timeline":[{"lang":"en","time":"2026-04-21T20:01:18.286Z","value":"Reported to Red Hat."},{"lang":"en","time":"2026-04-21T19:20:50.215Z","value":"Made public."}],"x_adpType":"supplier","x_generator":{"engine":"sadp-cli 1.0.0"}}]}}}