CVE-2026-58649
.NET Information Disclosure Vulnerability
MEDIUM
6.5
CVSS Score
Published: September 8, 2026 at 05:17 PM UTC
Updated: October 14, 2026 at 11:13 PM UTC
4 products affected across 1 vendorVisual Studio 2022.netVisual Studio 2026
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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.4%
SSVC
No known exploit
Description
Origin validation error in .NET allows an unauthorized attacker to disclose information over a network.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
10.0.0 ≤ v < 10.0.111, 10.0.40011.0.0 ≤ v < 11.0 RC18.0.0 ≤ v < 8.0.130, 8.0.4249.0.0 ≤ v < 9.0.120, 9.0.31710.0.011.0.011.0.0 preview111.0.0 preview211.0.0 preview311.0.0 preview411.0.0 preview511.0.0 preview611.0.0 preview78.0.09.0.0
Affected range stops below 10.0.111, 10.0.400, so it looks safe — our inference, not a vendor statement
Affected range stops below 11.0 RC1, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.0.130, 8.0.424, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.0.120, 9.0.317, so it looks safe — our inference, not a vendor statement
apple-macos (environment) · linux-linux-kernel (environment) · microsoft-windows (environment)
10.0.100 ≤ v < 10.0.11110.0.200 ≤ v < 10.0.4008.0.100 ≤ v < 8.0.1308.0.200 ≤ v < 8.0.4249.0.100 ≤ v < 9.0.1209.0.200 ≤ v < 9.0.317
apple-macos (environment) · linux-linux-kernel (environment) · microsoft-windows (environment)
17.14.0 ≤ v < 17.14.4017.14.0
Affected range stops below 17.14.40, so it looks safe — our inference, not a vendor statement
18.9.0 ≤ v < 18.9.318.9.0
Affected range stops below 18.9.3, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58649SSVC — Action Prioritization
SSVCNo known exploitNot automatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
6.5MEDIUMmicrosoft
Vector?
Quick Info
StatusANALYZED
CWE
CWE-346
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