External risk intelligence

WordPress Post Grid Plugin Unauthenticated Hook Injection Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2024-11080

The vulnerability affects a WordPress plugin, which is a type of web application component commonly deployed on public-facing websites. Because it is intended for web content delivery and is reachable via the internet as part of the standard web server interface, it constitutes an externally accessible attack surface.

Code Injection

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This advisory addresses a critical vulnerability found in a WordPress plugin that allows for content creation and presentation. The flaw enables unauthenticated attackers to execute arbitrary code, posing a significant risk to website integrity and data. The main concern is confirming the relevance and exposure of this plugin within our environment to assess potential impact.

Unauthenticated attackers can execute code on WordPress.
Critical vulnerability could compromise website integrity and data.
Confirm relevance and exposure to understand potential impact.

Attack Path

How an attacker could exploit the issue

An attacker can exploit this vulnerability by sending a specially crafted request to a WordPress site using the affected plugin. If the plugin's security controls are not in place, the attacker can inject malicious code through specific functions, potentially leading to unauthorized actions on the WordPress system.

No authentication required.
Inject code via form functions.
Leads to arbitrary action execution.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow unauthenticated attackers to inject arbitrary actions into WordPress when supported by the plugin's functions and no other security controls are in place. This could affect the integrity and availability of the WordPress site.

WordPress core actions.
Via unauthenticated hook injection.
Compromise site integrity and availability.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in the Post Grid and Gutenberg Blocks – ComboBlocks WordPress plugin likely impacts organizations using this extension for their websites. The primary responsibility for addressing this will fall to the teams managing WordPress instances, which could include application owners, platform teams, or specific web administration groups. The immediate first step is to identify all WordPress sites utilizing this plugin, assess their exposure and criticality, and then engage the accountable owner to plan a coordinated remediation effort.

Plugin owners must identify affected sites.
Verify plugin reachability and business criticality.
Plan vendor coordination for fixes.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is the Post Grid and Gutenberg Blocks plugin?

This software is an extension for WordPress that provides tools for designing content layouts and block-based elements. Users typically install it to customize how posts and media appear on their site without writing custom code. It operates as a component within the WordPress content management ecosystem.

What does Unauthenticated Hook Injection mean for CVE-2024-11080?

This vulnerability falls under the weakness class of Code Injection (CWE-94). It means the plugin lacks proper security checks in its form-handling functions, allowing an outside user to trigger internal WordPress processes. By interacting with these specific hooks, an attacker can force the site to execute unauthorized actions.

How can an attacker trigger this vulnerability?

An attacker initiates this by sending a specifically formatted request to a site running the vulnerable plugin versions. This bug relies on the absence of additional security layers within the affected functions to block the request. It is important to note that simply visiting the site or browsing existing pages without these crafted requests does not trigger the flaw.

Is my site at risk from this vulnerability?

Halo Surface Signal indicates this plugin is typically used on public-facing websites, making it externally accessible. If your WordPress site is reachable via the internet and uses an affected version of this plugin, it faces a higher risk of being targeted because the vulnerability does not require any user account or password to exploit.

What should I do if I use this WordPress plugin?

The first step is to audit your environment to locate all WordPress instances where this plugin is currently installed and active. Once identified, verify which sites use versions 2.2.32 through 2.3.1. Prioritize these for review and work with your web administration or site owner teams to plan and apply the necessary updates provided by the vendor.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.