What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-13 · updated 2026-09-09
• Weakness: CWE-506

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

• WPManageNinja Fluent Forms Pro: 6.2.7

References

• 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
• https://wordpress.org/plugins/fluentform/
• https://wpmanageninja.com/security-incident-on-31-july-2026/
• https://www.vulncheck.com/advisories/fluent-forms-pro-embedded-malicious-code-via-tampered-plugin-build

Get alerted when CVE-2026-73532 or the next vulnerability affects your stack