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Fast & Fancy Filter – 3F Plugin Vulnerability (CVE-2026-6396)

Nick Paliughi
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Security Alert Summary

The Fast & Fancy Filter – 3F plugin for WordPress (up to and including 1.2.2) contains a Cross-Site Request Forgery (CSRF) vulnerability due to a missing nonce verification in the saveFields() function that handles the fff_save_settins AJAX action. An attacker who can trick an authenticated administrator into performing an action (for example, clicking a link) may be able to modify plugin filter settings, update arbitrary options, or create new filter posts via a forged request.

CVE Details

  • CVE ID: CVE-2026-6396
  • Affected component: The Fast & Fancy Filter – 3F plugin for WordPress
  • Affected versions: Versions up to and including 1.2.2
  • Published: April 22, 2026 at 9:16:26 AM
  • Last modified: April 22, 2026 at 9:16:26 AM
  • CVSS v3.1: Base score 4.3 (MEDIUM) — Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
  • Authentication / privileges / user interaction: Authentication not required; Privileges required: None; User interaction: Required
  • Primary impact: Confidentiality: None; Integrity: Low; Availability: None
  • Weakness (CWE): CWE-352 (Cross-Site Request Forgery)

Technical Details

According to the provided description, the vulnerability exists because the saveFields() function, which handles the fff_save_settins AJAX action, does not perform nonce verification. Nonces in WordPress are intended to ensure that state-changing requests originate from an expected, user-initiated context. Without nonce checks, an attacker can craft a forged request that, if executed by an authenticated administrator or another privileged user, causes the plugin to process and apply the attacker’s supplied data.

The observable impacts listed in the report are modification of plugin filter settings, updating of arbitrary options, or creation of new filter posts via a forged request. The vulnerability requires user interaction (an admin or similarly privileged user must be tricked into taking an action), and the CVSS scoring indicates the primary concern is limited integrity impact rather than confidentiality or availability.

How This Could Impact Your Website

Consider a typical WordPress site with a site owner, an internal editor, and an external contractor who contributes content. If an attacker tricks an administrator into clicking a malicious link while logged in, the attacker could cause the plugin’s filter settings to change or create new filter posts. Practical consequences include altered site behavior driven by changed filter rules, unexpected content appearing on the site, or configuration changes that affect how users interact with filtered content.

Because the reported impacts are primarily on integrity rather than confidentiality, this issue does not indicate direct exposure of sensitive data. However, unexpected content or configuration changes can still undermine trust, create user confusion, or be used as part of broader social engineering or phishing attempts. If youre unsure whether your site is affected or how to assess your current user roles and plugins, it may be worth having a professional review.

Recommended Actions

  • Update the affected plugin as soon as a patched version is available.
  • Review and reduce unnecessary user roles, especially contributors and administrators who do not need full privileges.
  • Enforce strong passwords and enable two-factor authentication for editors and administrators.
  • Remove unused or unmaintained plugins from your site.
  • Monitor site activity and logs for unusual behavior or unexpected configuration changes.

If youd like help reviewing your plugins, user roles, or overall WordPress security posture, our team at Freshy is happy to help.

References

Nick Paliughihttps://freshysites.com/team/nick-paliughi/
Nick was born in California and now resides in Lake Worth, FL. He has 10 years of experience building and maintaining sites in WordPress, which he is excited to put to use at Freshy. Prior to starting at Freshy in 2022 his focus was on WordPress security & malware removal. When he’s not tending to your website, Nick is installing exhibitions at art galleries and museums in Palm Beach County, and if he’s lucky surfing at the Lake Worth pier.

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