CVE-2026-5158: PostX <= 5.0.13 - Authenticated (Contributor+) Stored Cross-Site Scripting via Post Comments Block
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-5158?
The severity of CVE-2026-5158 is medium with a score of 6.4.
How do I fix CVE-2026-5158?
To fix CVE-2026-5158, update the PostX plugin to version 5.0.14 or later.
What type of vulnerability is CVE-2026-5158?
CVE-2026-5158 is a Stored Cross-Site Scripting (XSS) vulnerability.
Which software is affected by CVE-2026-5158?
CVE-2026-5158 affects the PostX plugin for WordPress.
What versions of the PostX plugin are vulnerable to CVE-2026-5158?
All versions of the PostX plugin up to and including 5.0.13 are vulnerable to CVE-2026-5158.