CVE-2026-73532
Fluent Forms Pro 6.2.7 Embedded Malicious Code via Tampered Plugin Build
- State
- Published
- Severity
- 9.3 Critical
- Published
- Aug 13, 2026
- Updated
- Aug 14, 2026
- Reserved
- Aug 12, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 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 | VulnCheck |
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-506 Embedded Malicious Code
Affected Products
| Product | Versions |
|---|---|
Fluent Forms ProWPManageNinja |
|
References
- WPManageNinja Security Incidenttechnical-description
- WP Plugin Pageproduct
- Patchstack Advisorythird-party-advisory
- https://www.vulncheck.com/advisories/fluent-forms-pro-embedded-malicious-code-via-tampered-plugin-buildthird-party-advisory
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