CVE-2026-58649: .NET Information Disclosure Vulnerability

Medium severity · published Sep 8, 2026

CVE-2026-58649

.NET Information Disclosure Vulnerability

6.5

CVSS

0.4%

EPSS

On KEV

Description

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

CVSS vector

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

Attack vector

Network

Complexity

Low

Privileges

None

User interaction

Required

Confidentiality

High

Integrity

None

Availability

None

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.4% · higher than 30% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

.NET 10.0 · Microsoft

10.0.0 before 10.0.111, 10.0.400 · source: vendor

.NET 11.0 · Microsoft

11.0.0 before 11.0 RC1 · source: vendor

.NET 8.0 · Microsoft

8.0.0 before 8.0.130, 8.0.424 · source: vendor

.NET 9.0 · Microsoft

9.0.0 before 9.0.120, 9.0.317 · source: vendor

Microsoft Visual Studio 2022 version 17.14 · Microsoft

17.14.0 before 17.14.40 · source: vendor

Microsoft Visual Studio 2026 version 18.9 · Microsoft

18.9.0 before 18.9.3 · source: vendor

.net · Microsoft

11.0.0; 11.0.0; 11.0.0; 11.0.0; 11.0.0; 11.0.0; +1 more · source: NVD

.net Sdk · Microsoft

8.0.100 before 8.0.130; 8.0.200 before 8.0.424; 9.0.100 before 9.0.120; 9.0.200 before 9.0.317; 10.0.100 before 10.0.111; 10.0.200 before 10.0.400 · source: NVD

Visual Studio 2022 · Microsoft

17.14.0 before 17.14.40 · source: NVD

Visual Studio 2026 · Microsoft

18.9.0 before 18.9.3 · source: NVD

Affected product

.NET 10.0

Microsoft

All .NET 10.0 CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-58649

CVE.org

https://www.cve.org/CVERecord?id=CVE-2026-58649

vendor-advisory

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