Live Composer permits contributor-level PHP object injection

Live Composer through 2.1.18 deserializes untrusted input, allowing a Contributor or higher-privileged user to inject PHP objects. The advisory reports no known usable object gadget chain in Live Composer itself; file deletion, data disclosure, or code execution requires a suitable chain in another installed plugin or theme. The official changelog confirms the PHP object injection fix in 2.1.19.

CVE / CNA score 8.8 CVSS 3.1 · security@wordfence.com

NVD score Pending NVD has not published its own CVSS assessment.

Component: Live Composer – Free WordPress Website Builder
Plugin slug: live-composer-page-builder
Affected: <= 2.1.18
Safe version: 2.1.19
Published: Sep 08, 2026
Weakness: CWE-502 — Deserialization of Untrusted Data

This CVE was published Sep 08, 2026 and is one of 15 known issues for this plugin.

What to do

Update, patch or deactivate.

Update Live Composer to 2.1.19 or later. Keep other plugins and themes updated and review untrusted Contributor access. The checked current release is 2.1.20.

A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.

Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.

Source record

Technical description

The Live Composer – Free WordPress Website Builder plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 2.1.18 via deserialization of untrusted input . This makes it possible for authenticated attackers, with contributor-level access and above, to inject a PHP Object. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present.

CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Primary and upstream sources

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