Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0084, the 58th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 14 Jul 2026, 18:45 UTC Confirmed by the CVE List
2. 31 Oct 2026, 15:22 UTC First seen by agentprime
3. 31 Oct 2026, 15:22 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-2p3q-h3hg-jcqq
• OSV: GHSA-2p3q-h3hg-jcqq
• github.com/dotnet/aspnetcore/security/advisories/GHSA-2p3q-h3hg-jcqq
• nvd.nist.gov/vuln/detail/CVE-2026-47303
• github.com/dotnet/announcements/issues/411
• github.com/dotnet/aspnetcore
• github.com/dotnet/aspnetcore/discussions/67786
• msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47303

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.