CVE-2026-1560
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Remote Code Execution in Lazy Blocks WordPress Plugin

Publication date: 2026-02-11

Last updated on: 2026-02-11

Assigner: Wordfence

Description
The Custom Block Builder – Lazy Blocks plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 4.2.0 via multiple functions in the 'LazyBlocks_Blocks' class. This makes it possible for authenticated attackers, with Contributor-level access and above, to execute code on the server.
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Meta Information
Published
2026-02-11
Last Modified
2026-02-11
Generated
2026-06-16
AI Q&A
2026-02-11
EPSS Evaluated
2026-06-14
NVD
CVE-2026-1560
EUVD
EUVD-2026-5960
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
wordfence lazy_blocks to 4.2.0 (inc)
wordfence lazy_blocks 4.2.1
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-94 The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.
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Impact Analysis

This vulnerability can have severe impacts as it allows attackers with relatively low privileges (Contributor-level access) to execute arbitrary code on the server hosting the WordPress site. This can lead to full compromise of the server, including unauthorized data access, data modification, defacement of the website, installation of malware, or further attacks on the network.

Compliance Impact

I don't know

Detection Guidance

I don't know

Executive Summary

The Custom Block Builder – Lazy Blocks plugin for WordPress has a Remote Code Execution (RCE) vulnerability in all versions up to and including 4.2.0. This vulnerability exists in multiple functions within the 'LazyBlocks_Blocks' class. It allows authenticated attackers with Contributor-level access or higher to execute arbitrary code on the server.

Mitigation Strategies

To mitigate the Remote Code Execution vulnerability in the Custom Block Builder – Lazy Blocks plugin for WordPress (CVE-2026-1560), you should immediately update the plugin to version 4.2.1 or later.

Version 4.2.1 addresses the vulnerability by improving media control components, enhancing error handling, and updating UI elements to prevent potential exploitation related to media uploads and data serialization.

Applying this update will secure the plugin against the vulnerability that allows authenticated attackers with Contributor-level access and above to execute code on the server.

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