Stored Cross-Site Scripting in Post Grid Gutenberg Blocks Plugin for WordPress
CVE-2026-15100

6.4MEDIUM

Key Information:

Vendor

WordPress
Status
Post Grid Gutenberg Blocks – Postx
Vendor
CVE Published:
24 July 2026

What is CVE-2026-15100?

The Post Grid Gutenberg Blocks – PostX plugin for WordPress contains a vulnerability that allows for Stored Cross-Site Scripting. This issue arises due to inadequate input sanitization and output escaping in the 'searchnoresult' block attribute. Authenticated users with contributor-level access or higher can exploit this flaw to inject malicious JavaScript into posts. When a user accesses a page containing this injected script, it executes in their browser, posing significant risks, especially in scenarios where a Contributor's draft post is previewed by Editors or Administrators.

Affected Version(s)

Post Grid Gutenberg Blocks – PostX 0 <= 5.0.32

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/ultimate-post/...
https://plugins.trac.wordpress.org/browser/ultimate-post/...

CVSS V3.1

Score:
6.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Wordfence PRISM
.