CVE-2026-96840

HighCVSS 7.2

Published: 10/10/2026(UTC)Updated: 13/10/2026(UTC)Translated: 10/10/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.24%

14th percentile - higher than 14% of all known CVEs

Summary

The Post Grid Gutenberg Blocks – PostX plugin for WordPress is vulnerable to stored XSS via the display_name user field in all versions up to and including 5.1.0.

Risk Assessment

A Subscriber-level user can store a double-quote in the display_name field, allowing script injection that executes when a user visits an infected page, potentially leading to data theft or session hijacking.

Recommendation

Update the PostX plugin to the latest version that includes a security fix.

Other vulnerabilities in Post Grid Gutenberg Blocks – PostX

CVE-2026-15100Medium
The Post Grid Gutenberg Blocks – PostX plugin for WordPress up to version 5.0.32 is vulnerable to stored XSS via the 'searchnoresult' block attribute. Insufficient input sanitization and output escaping allow authenticated attackers with contributor-level access or higher to inject arbitrary scripts that execute when an editor or administrator previews the page.

Original NVD description (English source)

The Post Grid Gutenberg Blocks – PostX plugin for WordPress is vulnerable to Stored Cross-Site Scripting via display_name User Field in all versions up to, and including, 5.1.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. WordPress core's pre_user_display_name filter encodes &, <, and > but leaves double-quotes intact (ENT_NOQUOTES), allowing a Subscriber-level user to store a double-quote in their display_name via /wp-admin/profile.php that subsequently breaks out of the alt="" attribute at Archive_Title.php:144.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS