by Kastro
Paper/Archive/CVE-2026-73532

CVE-2026-73532

WPManageNinja Fluent Forms Pro — Fluent Forms Pro 6.2.7 Embedded Malicious Code via Tampered Plugin Build

EPSS 0.7%CVSS 9.8
critical.is priorityof 100
40
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 52.0.520 × 2010.4No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
Fluent Forms Pro6.2.7–CNA

Scores by source

VulnCheck (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

writeupwpmanageninja.com/security-incident-on-31-july-2026refwordpress.org/plugins/fluentformwriteuppatchstack.com/database/wordpress/plugin/fluentformpro/vulnerability/wordpress-fluent-forms-pro-add-on-pack-plugin-6-2-7-6-2-7-remote-code-execution-vulnerabilitywriteupvulncheck.com/advisories/fluent-forms-pro-embedded-malicious-code-via-tampered-plugin-build