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High

Missing Authentication Information Disclosure in Azure MCP Server

IdentifiersCVE-2026-32211CWE-306· Missing Authentication for…

CVE-2026-32211 is a missing authentication for critical function vulnerability in Azure MCP Server. According to the provided Microsoft advisory content, the service exposed a critical function without required authentication, allowing an unauthorized attacker to access functionality over the network and disclose information. The issue is mapped to CWE-306. The provided CVSS v3.1 vector is AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N, indicating the vulnerable condition was remotely reachable, required no prior privileges, and did not require user interaction. The advisory identifies Azure MCP Server as an exclusively hosted service.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows an unauthenticated remote attacker to disclose sensitive information over the network. Based on the provided CVSS vector, the vulnerability has high confidentiality impact and high integrity impact, with no availability impact. This means exploitation could expose protected data and potentially affect the trustworthiness or correctness of data or service responses, but is not expected to directly cause service outage or denial of service.

Mitigation

If you can’t patch tonight, do this now.

No customer-side mitigation is required according to Microsoft. The vulnerability has already been fully mitigated by Microsoft within the cloud service.

Remediation

Patch, then assume compromise.

Microsoft states that the issue has already been fully remediated in the Azure MCP Server hosted service. No customer remediation action is required because the official fix was applied by Microsoft on the service side.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
Microsoft CorporationAzure Mcp Serverapplication
Microsoft CorporationAzure Web Appsapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

8 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity7

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-32211
NVD
nvd.nist.gov/vuln/detail/CVE-2026-32211
MITRE CWE · CWE-306
Missing Authentication for Critical Function
Vendor Advisory
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32211