CVE-2026-32211
Published: 03 April 2026
Summary
CVE-2026-32211 is a critical-severity Missing Authentication for Critical Function (CWE-306) vulnerability in Microsoft Azure Web Apps. Its CVSS base score is 9.1 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 47.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
This vulnerability is AI-related — categorised as AI Agent Protocols and Integrations; in the Protocol-Specific Risks risk domain.
The strongest mitigations our analysis identified are NIST 800-53 AC-14 (Permitted Actions Without Identification or Authentication) and AC-3 (Access Enforcement).
Deeper analysis
CVE-2026-32211 is a missing authentication vulnerability (CWE-306) affecting the Azure MCP Server. Published on 2026-04-03, it involves a critical function that lacks proper authentication, allowing unauthorized attackers to disclose information over a network. The issue carries a CVSS v3.1 base score of 9.1 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N), reflecting critical severity due to its network accessibility, low attack complexity, and high impacts on confidentiality and integrity.
An unauthorized attacker (PR:N) can exploit this vulnerability remotely over the network (AV:N) with low complexity and no user interaction. Exploitation enables disclosure of sensitive information, with additional high integrity impact potential as indicated by the CVSS metrics.
The Microsoft Security Response Center advisory provides details on mitigation and patches at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32211.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-18560
Vulnerability details
Missing authentication for critical function in Azure MCP Server allows an unauthorized attacker to disclose information over a network.
- CWE(s)
AI Security AnalysisAI
- AI Category
- AI Agent Protocols and Integrations
- Risk Domain
- Protocol-Specific Risks
- OWASP Top 10 for LLMs 2025
- None mapped
- Classification Reason
- Matched keywords: mcp
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Missing authentication (CWE-306) in a network-accessible Azure MCP Server directly enables remote exploitation of a public-facing application for initial access and sensitive data disclosure (AV:N/PR:N).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
AC-14 directly limits and reviews permitted actions without identification or authentication, preventing unauthorized access to the critical function lacking authentication.
AC-3 enforces approved access authorizations, ensuring authentication is required prior to accessing the vulnerable critical function.
IA-8 mandates unique identification and authentication for non-organizational users, blocking PR:N attackers from exploiting the missing authentication over the network.