CVE-2026-5158
Received Received - Intake

Stored XSS in PostX WordPress Plugin

Publication date: 2026-08-06

Last updated on: 2026-08-06

Assigner: Wordfence

Description
The Post Grid Gutenberg Blocks for News, Magazines, Blog Websites – PostX plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'inputPlaceHolder' parameter in all versions up to, and including, 5.0.13 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.

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Meta Information

Published
2026-08-06
Last Modified
2026-08-06
Generated
2026-08-06
AI Q&A
2026-08-06
EPSS Evaluated
N/A
NVD
CVE-2026-5158
EUVD
EUVD-2026-53863

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
wpdeveloper postx to 5.0.13 (inc)
wp_postx post_grid_gutenberg_blocks to 5.0.13 (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.

Attack-Flow Graph

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Executive Summary

The PostX WordPress plugin has a stored cross-site scripting (XSS) vulnerability in the 'inputPlaceHolder' parameter. This flaw allows authenticated attackers with Contributor-level access or higher to inject malicious scripts into web pages. The issue arises from insufficient input sanitization and output escaping.

Detection Guidance

This vulnerability can be detected by checking for the PostX plugin versions up to 5.0.13 in your WordPress installation. Inspect the plugin files for the 'inputPlaceHolder' parameter usage in the codebase. No specific commands are provided in the context.

Impact Analysis

An attacker could inject scripts that execute when users visit affected pages. This may lead to unauthorized actions on behalf of users, theft of sensitive data like cookies or session tokens, or defacement of the website. Users with Contributor access or higher are the primary threat actors.

Compliance Impact

This vulnerability could lead to data breaches, compromising user data and violating GDPR or HIPAA requirements for data protection. Organizations may face fines or legal consequences if exploited, as it undermines confidentiality and integrity of user information.

Mitigation Strategies

Immediately update the PostX plugin to the latest version beyond 5.0.13. If updating is not possible, consider disabling or removing the plugin until a patch is available. Review user roles to ensure only trusted users have Contributor-level access or higher.

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