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CVE-2026-73532 – Embedded Backdoor / Full Site Compromise – Fluent Forms Pro 6.2.7 (Supply Chain Com

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Summary

CVE-2026-73532 affects Fluent Forms Pro version 6.2.7, a commercial WordPress form-builder plugin from WPManageNinja. Due to a supply-chain compromise, a tampered build of the plugin was distributed containing embedded malicious code (CWE-506) that installed a backdoor REST endpoint, persistent malicious files, and unauthorized admin-level access on affected sites. The issue is rated Critical severity (9.3), as it enables full unauthenticated remote compromise of any site that installed the tampered build.

Technical details

  • Root cause: A decommissioned WPManageNinja update server was left reachable via proxy routing after the vendor migrated its licensing/update infrastructure. An attacker compromised this legacy server and used it to serve a modified copy of the plugin instead of the legitimate one.
  • Trigger conditions: Any WordPress site that downloaded or auto-updated Fluent Forms Pro to version 6.2.7 between roughly 14:00–19:00 UTC on July 31, 2026 received the tampered files.
  • Attack vector: Network — no interaction with the affected site is required by an attacker once the backdoor is installed; the malicious code itself was delivered through the plugin’s normal update channel.
  • Impact: The tampered build dropped a rogue PHP file that registered a hidden REST API route, wrote additional backdoor PHP files into mu-plugins and uploads directories, added rows to the WordPress database supporting command-and-control communication, and scheduled recurring tasks to maintain persistence — allowing an attacker to regain administrative control even after the plugin is updated to a clean version unless the leftover artifacts are manually removed.

Affected software

  • Fluent Forms Pro 6.2.7 (tampered build served July 31, 2026)
  • Ninja Tables Pro 5.2.11 was compromised in the same incident (separate plugin, same vendor/incident)

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • CVSS v4.0 Score: 9.3 (Critical) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Update Fluent Forms Pro to version 6.2.10 (and Ninja Tables Pro to 5.2.14 if installed), which are confirmed clean releases.
  • Updating the plugin alone is not sufficient — manually remove leftover backdoor artifacts:
    • Delete any injected files such as fluentformpro/libs/class-license-sync.php and unexplained hex-named PHP files under wp-content/mu-plugins/ and wp-content/uploads/.
    • Remove database rows referencing the command-and-control domain in wp_options.
    • Clear the scheduled tasks wp_update_check_schedule and wp_license_verify_schedule.
    • Review admin accounts and access logs for unauthorized activity, since attacker actions may appear under legitimate existing admin accounts.
    • Rotate WordPress secret keys/salts, admin passwords, and API tokens only after confirming cleanup is complete.

References

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