Vulnerability in Wpmanageninja Fluent Forms Pro
CVE-2026-73532
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (50.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.007 · change: +0.002
Affected products
- Wpmanageninja Fluent Forms Pro — versions 6.2.7
Weakness classification (CWE)
References
- patchstack.com/database/wordpress/plugin/fluentformpro/vulnerability/wordpress-… (third-party-advisory)
- wordpress.org/plugins/fluentform/ (product)
- wpmanageninja.com/security-incident-on-31-july-2026/ (technical-description)
- www.vulncheck.com/advisories/fluent-forms-pro-embedded-malicious-code-via-tampe… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-73532?
- CVE-2026-73532 is a critical-severity vulnerability in Wpmanageninja Fluent Forms Pro, classified under CWE-506. CVSS score: 9.8/10. Published 2026-08-13.
- How severe is CVE-2026-73532?
- Critical severity. CVSS v3 base score is 9.8 out of 10.