{"id":"CVE-2026-47300","title":"ASP.NET Core Elevation of Privilege Vulnerability","summary":"Incorrect implementation of authentication algorithm in ASP.NET Core allows an authorized attacker to elevate privileges over a network.","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","cvssSource":"cna","cwe":["CWE-303"],"vendor":"Microsoft","product":".NET 10.0","affected":[".net_10.0 >= 10.0.0 < 10.0.10",".net_8.0 >= 8.0.0 < 8.0.29",".net_9.0 >= 9.0.0 < 9.0.18","visual_studio_2022_version_17.12 >= 17.12.0 < 17.12.22","visual_studio_2022_version_17.14 >= 17.14.0 < 17.14.36","visual_studio_2026_version_18.7 >= 18.0 < 18.7.4"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-07-15T03:57:39.408951Z"},"published":"2026-07-14","updated":"2026-09-17","sourceUpdated":"2026-09-17T22:28:31.250Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-47300","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47300","label":"ASP.NET Core Elevation of Privilege Vulnerability"},{"url":"https://github.com/dotnet/aspnetcore/security/advisories/GHSA-8prm-248r-h957"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47300"},{"url":"https://github.com/dotnet/announcements/issues/409"},{"url":"https://github.com/dotnet/aspnetcore/discussions/67785"},{"url":"https://github.com/advisories/GHSA-8prm-248r-h957"}],"tags":["cve.org","ghsa","nuget"],"epss":0.00527,"epssPercentile":0.43399,"aliases":["GHSA-8prm-248r-h957"],"ecosystem":"nuget","patched":["Microsoft.AspNetCore.Authentication.Negotiate 10.0.10","Microsoft.AspNetCore.Authentication.Negotiate 9.0.18","Microsoft.AspNetCore.Authentication.Negotiate 8.0.29"],"ingestedAt":"2026-07-21T16:51:41.815Z","slug":"CVE-2026-47300","body":"## Overview\n\nIncorrect implementation of authentication algorithm in ASP.NET Core allows an authorized attacker to elevate privileges over a network.\n\n## Affected\n\n- `.net_10.0 >= 10.0.0 < 10.0.10`\n- `.net_8.0 >= 8.0.0 < 8.0.29`\n- `.net_9.0 >= 9.0.0 < 9.0.18`\n- `visual_studio_2022_version_17.12 >= 17.12.0 < 17.12.22`\n- `visual_studio_2022_version_17.14 >= 17.14.0 < 17.14.36`\n- `visual_studio_2026_version_18.7 >= 18.0 < 18.7.4`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-47300)\n\nAffected packages:\n\n- `Microsoft.AspNetCore.Authentication.Negotiate >= 10.0.0, <= 10.0.9`\n- `Microsoft.AspNetCore.Authentication.Negotiate >= 9.0.0, <= 9.0.17`\n- `Microsoft.AspNetCore.Authentication.Negotiate >= 8.0.0, <= 8.0.28`\n\nPatched in:\n\n- `Microsoft.AspNetCore.Authentication.Negotiate 10.0.10`\n- `Microsoft.AspNetCore.Authentication.Negotiate 9.0.18`\n- `Microsoft.AspNetCore.Authentication.Negotiate 8.0.29`\n\nSource: https://github.com/advisories/GHSA-8prm-248r-h957","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}