CVE-2026-15100
Received Received - Intake

Stored XSS in Post Grid Gutenberg Blocks – PostX WordPress Plugin

Publication date: 2026-07-24

Last updated on: 2026-07-24

Assigner: Wordfence

Description
The Post Grid Gutenberg Blocks – PostX plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'searchnoresult' Block Attribute in all versions up to, and including, 5.0.32 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is particularly concerning in a cross-privilege scenario where a Contributor creates a pending or draft post containing the malicious block attribute, which then executes arbitrary JavaScript in the browser session of an Editor or Administrator who previews that post.

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Meta Information

Published
2026-07-24
Last Modified
2026-07-24
Generated
2026-07-24
AI Q&A
2026-07-24
EPSS Evaluated
N/A
NVD
CVE-2026-15100
EUVD
EUVD-2026-48461

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wpdeveloper postx to 5.0.32 (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

The Post Grid Gutenberg Blocks – PostX WordPress plugin has a stored cross-site scripting (XSS) vulnerability in the 'searchnoresult' block attribute. This flaw allows authenticated attackers with contributor-level access or higher to inject malicious scripts into pages. The scripts execute when users, including editors or administrators, access the infected pages.

Detection Guidance

To detect this vulnerability, inspect WordPress sites using the Post Grid Gutenberg Blocks – PostX plugin versions up to 5.0.32. Check for malicious 'searchnoresult' block attributes in posts or pages. Use WordPress admin dashboard to review pending/draft posts for suspicious scripts.

Impact Analysis

An attacker could steal sensitive user data, hijack sessions, or perform actions on behalf of users. If a contributor creates a draft post with malicious code, an editor or admin previewing it could unknowingly trigger the script, leading to potential account compromise or unauthorized actions on the site.

Compliance Impact

This vulnerability could lead to unauthorized data access or breaches, violating GDPR's data protection requirements or HIPAA's patient privacy rules. If exploited, it may result in data leaks, triggering compliance violations, legal penalties, or reputational damage for organizations handling sensitive data.

Mitigation Strategies

Immediately update the Post Grid Gutenberg Blocks – PostX plugin to the latest version. Remove or disable the plugin if updates are unavailable. Review all posts for injected scripts, especially pending/draft posts. Restrict contributor-level access to minimize attack surface.

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