Vulnerability · Published Aug 13, 2026 · Assigned by VulnCheck

CVE-2026-73532Fluent Forms Pro 6.2.7 Embedded Malicious Code via Tampered Plugin Build

Critical 9.8

In plain English

A critical-severity security flaw in Fluent Forms Pro from WPManageNinja. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)0.7%top 47.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
WPManageNinja	Fluent Forms Pro	6.2.7

Weakness: CWE-506 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

WPManageNinja Security Incident technical-description
WP Plugin Page product
Patchstack Advisory third-party-advisory
https://www.vulncheck.com/advisories/fluent-forms-pro-embedded-malicious-code-via-tampered-plugin-build third-party-advisory