Libre Form <= 1.5.0.1 - Unauthenticated Remote Code Execution
Strategic Overview
- Status
- Unpatched
- Affected Plugin
- WP Libre Form
- Affected Version
<= 1.5.0.1- CVSS
- 9.8Critical
- Weakness type
- CWE-94 · Improper Control of Generation of Code
- CVE
CVE-2026-118423
At a glance
CVE-2026-118423 is a critical-severity Improper Control of Generation of Code vulnerability in the WP Libre Form WordPress plugin, affecting versions <= 1.5.0.1. It carries a CVSS score of 9.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires no authentication. No fixed release has been reported yet; treat installations running this software as exposed. Disclosed November 2026, reported by Enrico Marcolini.
Vulnerability Overview
The Libre Form plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 1.5.0.1. This is due to insufficient validation of user supplied input before it is executed. This makes it possible for unauthenticated attackers to execute arbitrary code on the server.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.
CWE-94: Improper Control of Generation of Code
Reaching this weakness in WP Libre Form <= 1.5.0.1 takes no account at all. Code injection means input from a request reaches a language construct that evaluates code, so the attacker's text is executed rather than treated as data.
The injected code runs with the web server's privileges, giving the attacker the same access to the database and filesystem as WordPress itself. No fixed build of this plugin is recorded for WP Libre Form yet, so installs running <= 1.5.0.1 stay exposed until the vendor ships one.
Remediation
No known patch available. Please review the vulnerability's details in depth and employ mitigations based on your organization's risk tolerance. It may be best to uninstall the affected software and find a replacement.
How does WordSec protect against this?
Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. Classes like this one can leave something behind, so the staged malware scanner is the second half: it looks for dropped files and modified code rather than for the request that created them. No patched version is recorded yet, which is the case where a filtering layer matters most, because there is nothing to update to.
- Firewall
- Scanner
- Login Security
External References
Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C