CVE-2026-39575
Received Received - Intake
DOM-Based XSS in Custom Query Blocks ≤ 5.5.0 Allows Code Injection

Publication date: 2026-04-08

Last updated on: 2026-04-10

Assigner: Patchstack

Description
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Ronald Huereca Custom Query Blocks post-type-archive-mapping allows DOM-Based XSS.This issue affects Custom Query Blocks: from n/a through <= 5.5.0.
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Meta Information
Published
2026-04-08
Last Modified
2026-04-10
Generated
2026-06-16
AI Q&A
2026-04-08
EPSS Evaluated
2026-06-15
NVD
CVE-2026-39575
EUVD
EUVD-2026-20223
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
ronald_huereca custom_query_blocks to 5.5.0 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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Executive Summary

This vulnerability is a type of Cross-site Scripting (XSS) known as DOM-Based XSS. It occurs in the Ronald Huereca Custom Query Blocks plugin, specifically in the post-type-archive-mapping feature. The issue arises because the plugin improperly neutralizes input during web page generation, allowing malicious scripts to be injected and executed in the user's browser.

Impact Analysis

This vulnerability can allow attackers to execute malicious scripts in the context of the affected website. This can lead to unauthorized actions such as stealing user session cookies, defacing the website, redirecting users to malicious sites, or performing actions on behalf of the user without their consent.

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