Description
Origin validation error in .NET allows an unauthorized attacker to disclose information over a network.
Affected products
microsoft: .net; microsoft: .net sdk; apple: macos; linux: linux kernel; microsoft: windows; microsoft: visual studio 2022; microsoft: visual studio 2026
References1
- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58649 PatchVendor Advisory
Metrics
- CVSS 3.1
-
6.5
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N - EPSS — exploit probability
- 0% percentile: 30 · as of 3 November 2026
- CWE
- CWE-346
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.