CVE-2026-2745

import requests # Target URL (Example) target_url = "https://gitlab.example.com/users/sign_in" # Attacker's credentials (assumed obtained via phishing or other means) username = "victim_user" password = "victim_password" # Session creation session = requests.Session() # Step 1: Perform initial login to get the session cookie and trigger 2FA login_data = { "user[login]": username, "user[password]": password, "authenticity_token": "" # Need to scrape token from page first } # response = session.post(target_url, data=login_data) # Step 2: Exploit the inconsistent validation to bypass WebAuthn # The vulnerability lies in how the 'remember_device' or WebAuthn response is handled. # Sending a malformed or empty WebAuthn response might bypass the check in vulnerable versions. bypass_payload = { "user[remember_me]": "0", # In a real exploit, specific parameters causing the validation skip would be set here "device_response": "bypass_payload_simulation" } # Simulating the bypass request # exploit_response = session.post(target_url + "/webauthn", data=bypass_payload) # if exploit_response.status_code == 200: # print("[+] Authentication bypassed! Access granted.") # else: # print("[-] Exploit failed.") print("This is a conceptual PoC for CVE-2026-2745 demonstrating the bypass logic.")

{"cve": {"id": "CVE-2026-2745", "sourceIdentifier": "[email protected]", "published": "2026-03-25T17:16:57.803", "lastModified": "2026-03-26T20:54:09.500", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "GitLab has remediated an issue in GitLab CE/EE affecting all versions from 7.11 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1 that could have allowed an unauthenticated user to bypass WebAuthn two-factor authentication and gain unauthorized access to user accounts due to inconsistent input validation in the authentication process."}, {"lang": "es", "value": "GitLab ha remediado un problema en GitLab CE/EE que afecta a todas las versiones desde la 7.11 anterior a la 18.8.7, la 18.9 anterior a la 18.9.3, y la 18.10 anterior a la 18.10.1 que podría haber permitido a un usuario no autenticado eludir la autenticación de dos factores de WebAuthn y obtener acceso no autorizado a cuentas de usuario debido a una validación de entrada inconsistente en el proceso de autenticación."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N", "baseScore": 6.8, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.6, "impactScore": 5.2}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "baseScore": 8.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-288"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*", "versionStartIncluding": "7.11.0", "versionEndExcluding": "18.8.7", "matchCriteriaId": "BC1BE350-F69B-4723-9253-3AD72B05258E"}, {"vulnerable": true, "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*", "versionStartIncluding": "7.11.0", "versionEndExcluding": "18.8.7", "matchCriteriaId": "61B4B116-5BAD-4AA0-BC4F-E6306107497F"}, {"vulnerable": true, "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*", "versionStartIncluding": "18.9.0", "versionEndExcluding": "18.9.3", "matchCriteriaId": "96F7E7EC-4C2E-4A48-8134-9262B251C89C"}, {"vulnerable": true, "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*", "versionStartIncluding": "18.9.0", "versionEndExcluding": "18.9.3", "matchCriteriaId": "C3240349-67A3-43E2-BAD9-EFAA3E0A5D31"}, {"vulnerable": true, "criteria": "cpe:2.3:a:gitlab:gitlab:18.10.0:*:*:*:community:*:*:*", "matchCriteriaId": "D5B6ECC9-6AEA-4DD0-B12B-A3A7A9FE91DA"}, {"vulnerable": true, "criteria": "cpe:2.3:a:gitlab:gitlab:18.10.0:*:*:*:enterprise:*:*:*", "matchCriteriaId": "2B8DF779-B99E-4096-B734-78AB1849D136"}]}]}], "references": [{"url": "https://about.gitlab.com/releases/2026/03/25/patch-release-gitlab-18-10-1-released/", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://gitlab.com/gitlab-org/gitlab/-/work_items/590810", "source": "[email protected]", "tags": ["Broken Link"]}, {"url": "https://hackerone.com/reports/3557844", "source": "[email protected]", "tags": ["Permissions Required"]}]}}