---
id: CVE-2026-73532
title: >-
  Fluent Forms Pro 6.2.7 contains an embedded malicious code vulnerability
  introduced via a tampered plugin build served through a decommissioned update
  server
summary: >-
  Fluent Forms Pro 6.2.7 contains an embedded malicious code vulnerability
  introduced via a tampered plugin build served through a decommissioned update
  server. The tampered build introduced a rogue PHP file
  (libs/class-license-sync.php), …
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-506
vendor: WPManageNinja
product: Fluent Forms Pro
affected:
  - fluent_forms_pro 6.2.7
published: '2026-08-13'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T20:35:08.537'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73532'
references:
  - url: >-
      https://patchstack.com/database/wordpress/plugin/fluentformpro/vulnerability/wordpress-fluent-forms-pro-add-on-pack-plugin-6-2-7-6-2-7-remote-code-execution-vulnerability
    label: disclosure@vulncheck.com
  - url: 'https://wordpress.org/plugins/fluentform/'
    label: disclosure@vulncheck.com
  - url: 'https://wpmanageninja.com/security-incident-on-31-july-2026/'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/fluent-forms-pro-embedded-malicious-code-via-tampered-plugin-build
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-08-14T16:47:48.823900Z'
ingestedAt: '2026-09-13T05:20:46.847Z'
epss: 0.00671
epssPercentile: 0.49944
---

## Overview

Fluent Forms Pro 6.2.7 contains an embedded malicious code vulnerability introduced via a tampered plugin build served through a decommissioned update server. The tampered build introduced a rogue PHP file (libs/class-license-sync.php), loaded via a require_once directive added to fluentformpro.php, that established a backdoor REST API endpoint, dropped persistent PHP files in mu-plugins and uploads directories, installed a passwordless administrator account, and registered scheduled tasks that survived plugin removal.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.