Stored Cross-Site Scripting Vulnerability in PostX Plugin for WordPress
CVE-2026-5158

6.4MEDIUM

Key Information:

Vendor

WordPress
Status
Post Grid Gutenberg Blocks – Postx
Vendor
CVE Published:
6 August 2026

What is CVE-2026-5158?

The PostX plugin for WordPress, designed for news, magazine, and blog websites, is exposed to a Stored Cross-Site Scripting (XSS) vulnerability. This issue arises from inadequate input sanitization and output escaping in the 'inputPlaceHolder' parameter. Authenticated users, particularly those with Contributor-level access or higher, can exploit this flaw to inject malicious scripts into content, leading to potential execution of these scripts when unsuspecting users view the modified pages.

Affected Version(s)

Post Grid Gutenberg Blocks – PostX 0 <= 5.0.13

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/changeset/3501596/ulti...

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

Muhammad Yudha - DJ
.