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.

CVSS Scores

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Meta Information

Published

2026-04-08

Last Modified

2026-04-10

Generated

2026-07-06

AI Q&A

2026-04-08

EPSS Evaluated

2026-07-05

NVD

CVE-2026-39575

EUVD

EUVD-2026-20223

Affected Vendors & Products

Vendor	Product	Version / Range
ronald_huereca	custom_query_blocks	to 5.5.0 (inc)

Helpful Resources

Exploitability

CWE

KEV

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.

Attack-Flow Graph

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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