CVE-2026-47300High· 8.8▾ TwilightIncorrect implementation of authentication algorithm in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Jul 21.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.5%
Last analysed / modified upstream
Incorrect implementation of authentication algorithm in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
.net_10.0 >= 10.0.0 < 10.0.10.net_8.0 >= 8.0.0 < 8.0.29.net_9.0 >= 9.0.0 < 9.0.18visual_studio_2022_version_17.12 >= 17.12.0 < 17.12.22visual_studio_2022_version_17.14 >= 17.14.0 < 17.14.36visual_studio_2026_version_18.7 >= 18.0 < 18.7.4Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
Microsoft.AspNetCore.Authentication.Negotiate >= 10.0.0, <= 10.0.9Microsoft.AspNetCore.Authentication.Negotiate >= 9.0.0, <= 9.0.17Microsoft.AspNetCore.Authentication.Negotiate >= 8.0.0, <= 8.0.28Patched in:
Microsoft.AspNetCore.Authentication.Negotiate 10.0.10Microsoft.AspNetCore.Authentication.Negotiate 9.0.18Microsoft.AspNetCore.Authentication.Negotiate 8.0.29Connected by shared product, vendor, weakness, or advisory.
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