CVE-2026-32178
Published: 14 April 2026
Summary
CVE-2026-32178 is a high-severity Improper Neutralization of Special Elements (CWE-138) vulnerability in Microsoft .Net. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 13.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SC-23 (Session Authenticity) and SI-10 (Information Input Validation).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
SI-2 requires timely flaw remediation through patching the specific improper neutralization vulnerability in .NET, preventing exploitation of CVE-2026-32178.
SI-10 enforces information input validation and neutralization of special elements in network traffic, directly countering the CWE-138 vulnerability in .NET.
SC-23 protects the authenticity of communications sessions, mitigating network-based spoofing attacks enabled by this .NET vulnerability.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Remote network-accessible .NET neutralization flaw directly enables exploitation via T1190 (public-facing app) and facilitates network spoofing behaviors covered by T1557 (Adversary-in-the-Middle).
NVD Description
Improper neutralization of special elements in .NET allows an unauthorized attacker to perform spoofing over a network.
Deeper analysisAI
CVE-2026-32178 is an improper neutralization of special elements vulnerability (CWE-138) in .NET that enables an unauthorized attacker to perform spoofing over a network. Published on 2026-04-14, it carries a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N), highlighting its network accessibility, low attack complexity, lack of prerequisites, and significant confidentiality impact.
Any unauthenticated attacker can exploit this vulnerability remotely without user interaction by sending crafted network traffic that bypasses neutralization controls in .NET. Successful exploitation allows spoofing, potentially leading to high-impact confidentiality violations, such as unauthorized access to sensitive data.
Mitigation guidance is available in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32178.
Details
- CWE(s)