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CriticalASP.NET

CVE-2026-40372

Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.

CVSS Base Score
9.1

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

Exploit Probability
96%EPSS PERCENTILE0100

More exploitable than 96% of all CVEs · Top 4%

2%

of the sites UNPWNED scans run ASP.NET, the technology this CVE affects. Version determines exposure, so scan yours to know for sure.Aggregate across 700 scanned sites. No site is identified.

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Details
Published
2026-04-21
Last modified
2026-07-15
Affected
ASP.NET
References
NVD Detail OSV.dev GitHub Advisories

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Data from the National Vulnerability Database (NVD), CISA KEV, and FIRST.org EPSS. This product uses the NVD API but is not endorsed or certified by the NVD. EPSS is a probability estimate, not a guarantee of exploitation.