Microsoft Security Advisory CVE-2026-70194 - .NET and Visual Studio Security Feature Bypass 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 0.0049, the 42nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 13 Oct 2026, 19:00 UTC Confirmed by the CVE List
2. 31 Oct 2026, 15:21 UTC First seen by agentprime
3. 31 Oct 2026, 15:21 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-fqpq-cx42-9jmm
• OSV: GHSA-fqpq-cx42-9jmm
• github.com/dotnet/runtime/security/advisories/GHSA-fqpq-cx42-9jmm
• nvd.nist.gov/vuln/detail/CVE-2026-70194
• github.com/dotnet/announcements/issues/464
• github.com/dotnet/runtime/issues/135701
• github.com/dotnet/runtime
• msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70194

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.