CVE-2026-40372
CriticalCVSS 9.1Exploitation Probability (EPSS)
Very high risk95th percentile - higher than 95% of all known CVEs
Summary
A vulnerability in ASP.NET Core due to improper verification of cryptographic signature allows an unauthorized attacker to elevate privileges over a network.
Risk Assessment
An attacker can gain elevated privileges within the application, leading to data confidentiality and integrity breaches and potential system compromise.
Recommendation
Immediately update ASP.NET Core to the latest patched version and review authentication and cryptographic signature configurations.
Other vulnerabilities in ASP.NET Core
See all- CVE-2017-11879High
ASP.NET Core 2.0 allows an attacker to steal log-in session information such as cookies or authentication tokens via a specially crafted URL.
- CVE-2017-0249High
An elevation of privilege vulnerability exists when ASP.NET Core fails to properly sanitize web requests.
- CVE-2021-31957Medium
ASP.NET Core has a Denial of Service (DoS) vulnerability that could lead to service overload and unavailability.
- CVE-2020-1161High
Denial of service vulnerability in ASP.NET Core when improperly handling web requests. A remote unauthenticated attacker could send specially crafted requests, causing the application to become unavailable.
- CVE-2026-69304Medium
Improper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network.
- CVE-2026-57099High
Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.
- CVE-2026-47303High
ASP.NET Core has an authentication bypass vulnerability due to assumed-immutable data. This allows an authorized attacker to elevate privileges over a network.
- CVE-2026-47300High
Incorrect implementation of authentication algorithm in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
- CVE-2026-56170High
Resource allocation without limits in ASP.NET Core allows an unauthorized attacker to perform a DoS attack over the network.
- CVE-2026-50506High
Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.
Original NVD description (English source)
Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

