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Critical 9.1Published Apr 21, 2026
CVE-2026-40372ASP.NET Core Elevation of Privilege Vulnerability
Updated under an hour ago ()
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It affects Microsoft ASP.NET Core 10.0 and 4 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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Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.
- CVSS
- 9.1 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C
- Weakness (CWE)
- CWE-347
- 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
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Microsoft ASP.NET Core 10.0 microsoft:asp.net_core_10.0 (from the name) | from 10.0 before 10.0.7 | CNA record |
Microsoft Microsoft Visual Studio 2026 version 18.5 microsoft:visual_studio_2026_version_18.5 (from the name) | from 18.5.0 before 18.5.2 | CNA record |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | 10 | CISA ADP |
Red Hat Red Hat Hardened Images redhat:hummingbird | 1 | CISA ADP |
microsoft asp.net_core microsoft:asp.net_core | from 10.0.0 before 10.0.7 | NVD |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40372vendor-advisory, patch
- https://access.redhat.com/security/cve/CVE-2026-40372
- https://bugzilla.redhat.com/show_bug.cgi?id=2460224
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40372.json
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.