EUVD-2026-58113
GHSA-f3v6-4mcw-wrqj
Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Once the trojanized build is installed, the backdoor REST endpoint and passwordless admin are reachable unauthenticated over the network (AV:N/PR:N/UI:N), yielding full CIA compromise.
Primary rating from Vendor (vulncheck).
CVSS VectorVendor: vulncheck
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
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.
Articles & Coverage 1
AnalysisAI
Supply-chain backdoor in Fluent Forms Pro (Add-On Pack) 6.2.7 for WordPress was delivered as a tampered plugin build through a decommissioned update server, embedding malicious code (CWE-506) rather than a coding flaw. Any site that installed the poisoned 6.2.7 package gains a rogue license-sync PHP file that stands up an unauthenticated backdoor REST endpoint, creates a passwordless administrator, and drops persistent payloads that survive plugin removal. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the site installed the tampered Fluent Forms Pro 6.2.7 build distributed via the decommissioned update server - that install action is the precondition, and clean builds of the same version number are not affected. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine top-priority incident rather than an inflated CVSS number: the vulnerability is not theoretical exploitability but the confirmed distribution of live malicious code, so any operator who pulled 6.2.7 from the compromised update server is already compromised at the point of install. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An administrator updates or installs Fluent Forms Pro 6.2.7 and unknowingly receives the trojanized package from the decommissioned update server; on load, the rogue class-license-sync.php silently registers a backdoor REST endpoint and creates a passwordless admin account. A remote attacker who knows the implant then calls the hidden endpoint unauthenticated (or logs in as the planted admin) to run arbitrary PHP, and even if the operator later deletes the plugin, the mu-plugins payload and scheduled tasks re-establish access. … |
| Remediation | Because the risk is an installed backdoor rather than an exploitable code path, patching alone is insufficient: reinstall Fluent Forms Pro only from a verified clean build obtained directly from the vendor per the WPManageNinja incident advisory (https://wpmanageninja.com/security-incident-on-31-july-2026/), then perform incident response on any site that ran 6.2.7. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Conduct asset inventory to identify all WordPress installations running Fluent Forms Pro 6.2.7, immediately deactivate and remove the plugin, run comprehensive malware scans to detect backdoor artifacts, and audit user accounts for unauthorized admin-level access created after plugin installation. …
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Same weakness CWE-506 – Embedded Malicious Code
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External POC / Exploit Code
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