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Vulnerability record · CVE-2026-58649 · published 8 September 2026

CVE-2026-58649: Microsoft .net origin validation error vulnerability

Microsoft · .Net

Origin validation error in .NET allows an unauthorized attacker to disclose information over a network.

6.5 CVSS 3.1 Medium EPSS 0.27% · top 82.8% CWE-346 · Origin validation error
6.5CVSS 3.1 base score
0.27%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
1References
7 Oct 2026Last modified by NVD

Description

Origin validation error in .NET allows an unauthorized attacker to disclose information over a network.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58649 PatchVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-58649), CISA KEV, FIRST EPSS (scores of 2026-10-08). This page is refreshed as NVD updates the record.