# CVE-2026-58649

## Summary

- **CVE ID:** CVE-2026-58649
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C)
- **CWE:** CWE-346
- **Published:** Sep 8, 2026
- **Last Modified:** Sep 10, 2026

## Description

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

## Affected Products

- Microsoft — .NET 10.0 (10.0.0)
- Microsoft — .NET 11.0 (11.0.0)
- Microsoft — .NET 8.0 (8.0.0)
- Microsoft — .NET 9.0 (9.0.0)
- Microsoft — Microsoft Visual Studio 2022 version 17.14 (17.14.0)
- Microsoft — Microsoft Visual Studio 2026 version 18.9 (18.9.0)

## References

- [CNA](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58649)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.27%
- **EPSS Percentile:** 19.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._