Stored Cross-Site Scripting in Ultimate Post Plugin for WordPress
CVE-2026-13253

6.4MEDIUM

Key Information:

Vendor

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

What is CVE-2026-13253?

The Ultimate Post plugin for WordPress is affected by a Stored Cross-Site Scripting vulnerability caused by insufficient input sanitization in the 'moreResultsText' block attribute. Specifically, the render callback for the Advanced_Search block fails to properly escape HTML special characters, allowing authenticated users with contributor-level access to inject malicious scripts. When users access a compromised page, these scripts will execute, potentially leading to data theft or further exploitation.

Affected Version(s)

Post Grid Gutenberg Blocks – PostX 0 <= 5.0.31

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

PRISM
.