CVE-2026-40372 — AI Deep Analysis Summary

🚨 **Essence**: A critical data forgery flaw in Microsoft ASP.NET Core. 📉 **Consequences**: Attackers can forge data due to improper encryption signature verification.…

🔍 **Root Cause**: Improper verification of cryptographic signatures. 🛡️ **CWE**: CWE-347 (Improper Verification of Cryptographic Signature).…

🏢 **Vendor**: Microsoft. 📦 **Product**: ASP.NET Core. 📅 **Version**: Specifically **10.0**. 🌐 **Scope**: Cross-platform framework for Web, IoT, and Mobile Backend apps.

🔓 **Privileges**: Attackers can **elevate privileges** without authorization. 💾 **Data**: Full compromise of Confidentiality (C:H) and Integrity (I:H). 🌐 **Access**: Remote exploitation possible without user interaction.

📉 **Threshold**: LOW. 🚫 **Auth**: No authentication required (PR:N). 🖱️ **UI**: No user interaction needed (UI:N). 🌐 **Network**: Network accessible (AV:N). 🎯 **Complexity**: Low (AC:L). Easy to exploit remotely.

🚫 **Public Exp**: No. 📄 **PoCs**: None listed in the data (pocs: []). 🌍 **Wild Exp**: Not currently observed. ⏳ **Status**: Theoretical risk until PoC emerges.

🔍 **Check**: Scan for ASP.NET Core 10.0 instances. 📡 **Features**: Look for improper signature handling in request payloads. 🛠️ **Tools**: Use vulnerability scanners targeting CWE-347 in .NET environments.…

✅ **Fixed**: Yes. 📜 **Patch**: Official advisory available from Microsoft. 🔗 **Link**: [MSRC Advisory](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40372).…

🛡️ **Workaround**: If patching is delayed, implement strict input validation. 🔒 **Mitigation**: Enforce rigorous cryptographic signature checks at the application layer.…

🔥 **Urgency**: HIGH. 🚨 **CVSS**: High severity (C:H, I:H). 📅 **Published**: April 21, 2026. 🏃 **Priority**: Immediate patching recommended.…