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Medium 6.5Published Sep 8, 2026
CVE-2026-58649.NET Information Disclosure Vulnerability
Updated under an hour ago ()
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It affects Microsoft .NET 10.0 and 9 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Origin validation error in .NET allows an unauthorized attacker to disclose information over a network.
- CVSS
- 6.5 MEDIUM (v3.1, CNA)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
- Weakness (CWE)
- CWE-346
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- microsoft
- NVD analysis
- Analyzed
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Microsoft .NET 10.0 microsoft:net_10.0 (from the name) | from 10.0.0 before 10.0.111, 10.0.400 | CNA record |
Microsoft .NET 11.0 microsoft:net_11.0 (from the name) | 11.0.0 builds before 11.0 RC1 | CNA record |
Microsoft .NET 8.0 microsoft:net_8.0 (from the name) | from 8.0.0 before 8.0.130, 8.0.424 | CNA record |
Microsoft .NET 9.0 microsoft:net_9.0 (from the name) | from 9.0.0 before 9.0.120, 9.0.317 | CNA record |
Microsoft Microsoft Visual Studio 2022 version 17.14 microsoft:visual_studio_2022_version_17.14 (from the name) | from 17.14.0 before 17.14.40 | CNA record |
Microsoft Microsoft Visual Studio 2026 version 18.9 microsoft:visual_studio_2026_version_18.9 (from the name) | from 18.9.0 before 18.9.3 | CNA record |
microsoft .net microsoft:.net | 11.0.0; 11.0.0; 11.0.0; 11.0.0; 11.0.0; 11.0.0; 11.0.0 | NVD |
microsoft .net_sdk microsoft:.net_sdk | from 8.0.100 before 8.0.130; from 8.0.200 before 8.0.424; from 9.0.100 before 9.0.120; from 9.0.200 before 9.0.317; from 10.0.100 before 10.0.111; from 10.0.200 before 10.0.400 | NVD |
microsoft visual_studio_2022 microsoft:visual_studio_2022 | from 17.14.0 before 17.14.40 | NVD |
microsoft visual_studio_2026 microsoft:visual_studio_2026 | from 18.9.0 before 18.9.3 | NVD |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58649vendor-advisory, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.