Azure MCP Server
CVE-2026-26118 — Azure MCP Server Tools Elevation of Privilege Vulnerability
Executive Summary
Server-side request forgery (ssrf) in Azure MCP Server allows an authorized attacker to elevate privileges over a network.
Overview
8.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 7.7
EPSS Score
0.00959
probability of exploitation in the next 30 days
0.58442 percentile - updated 2026-08-14
View on FIRST.org
Affected Products
5 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Azure MCP Server Tools 1.0.0 (npm) | Release Notes (Security Update) |
Important | Elevation of Privilege | No |
| Azure MCP Server Tools 1.0.0 (NuGet) | Release Notes (Security Update) |
Important | Elevation of Privilege | No |
| Azure MCP Server Tools 2.0.0 (npm) | Release Notes (Security Update) |
Important | Elevation of Privilege | No |
| Azure MCP Server Tools 2.0.0 (NuGet) | Release Notes (Security Update) |
Important | Elevation of Privilege | No |
| Azure MCP Server Tools 2.0.0 (PyPi) | Release Notes (Security Update) |
Important | Elevation of Privilege | No |
Patches
1 patch
| Article | Type | Restart |
|---|---|---|
Release Notes |
Security Update | No |
Exploits & PoC
1 public PoCUnverified third-party code
Public proof-of-concept repositories aggregated from PoC-in-GitHub. They are not reviewed and may be incomplete, non-functional, or malicious — inspect the code before running anything.
| Repository | Stars | Published | Description |
|---|---|---|---|
| j-dahl7/mcp-attack-detection-sentinel | 2 | 2026-03-17 | Sentinel detection lab for MCP attack chains: CVE-2026-26118 SSRF token theft, tool poisoning, cross-server exfiltration, identity post-exploitation. Maps to OWASP Agentic Top 10. 5 analytics rules, 7 |
Detection Rules
No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.
Acknowledgments
References
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