CVE-2026-40372
ASP.NET Core Elevation of Privilege Vulnerability
Description
Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.
INFO
Published Date :
April 21, 2026, 8:16 p.m.
Last Modified :
April 27, 2026, 7:57 p.m.
Remotely Exploit :
No
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-40372
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | f38d906d-7342-40ea-92c1-6c4a2c6478c8 | ||||
| CVSS 3.1 | CRITICAL | [email protected] |
Public PoC/Exploit Available at Github
CVE-2026-40372 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-40372.
| URL | Resource |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40372 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-40372 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-40372
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Just some cybersecurity news
Automated GitHub Actions workflow that fetches and updates the latest cybersecurity news every Tuesday and Thursday using RSS feeds.
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-40372 vulnerability anywhere in the article.
-
The Register
Microsoft beefs up Remote Desktop security with ... hard-to-read messages
Microsoft's update to harden Remote Desktop against phishing attacks has arrived. When users open a Remote Desktop (.rdp) file, they should now see a warning listing all requested connection settings ... Read more
-
Ars Technica
Microsoft issues emergency update for macOS and Linux ASP.NET threat
Microsoft released an emergency patch for its ASP.NET Core to fix a high-severity vulnerability that allows unauthenticated attackers to gain SYSTEM privileges on devices that use the Web development ... Read more
-
security.nl
Microsoft komt met noodpatch voor kritiek lek in ASP.NET Core
Microsoft heeft een noodpatch uitgebracht voor een kritieke kwetsbaarheid (CVE-2026-40372) in ASP.NET Core waardoor een ongeauthenticeerde aanvaller via het netwerk SYSTEM-rechten kan krijgen. Het bev ... Read more
-
The Hacker News
Microsoft Patches Critical ASP.NET Core CVE-2026-40372 Privilege Escalation Bug
Microsoft has released out-of-band updates to address a security vulnerability in ASP.NET Core that could allow an attacker to escalate privileges. The vulnerability, tracked as CVE-2026-40372, carrie ... Read more
-
CybersecurityNews
Microsoft Emergency .NET 10.0.7 Update to Patch Elevation of Privilege Vulnerability
Microsoft has issued an emergency out-of-band (OOB) security update for .NET 10, releasing version 10.0.7 on April 21, 2026, to address a critical elevation of privilege vulnerability discovered in th ... Read more
-
Daily CyberSecurity
Critical RCE Alert: Bamboo Data Center Vulnerable to OS Command Injection
Atlassian has issued a high-priority advisory for its Bamboo Data Center users, detailing a critical-severity security flaw that could allow attackers to take full control of affected servers. The vul ... Read more
The following table lists the changes that have been made to the
CVE-2026-40372 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 27, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:* versions from (including) 10.0.0 up to (excluding) 10.0.7 Added Reference Type Microsoft Corporation: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40372 Types: Vendor Advisory -
New CVE Received by [email protected]
Apr. 21, 2026
Action Type Old Value New Value Added Description Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Added CWE CWE-347 Added Reference https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40372