Vulnerability Description
The Post Grid Gutenberg Blocks – PostX plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'searchnoresult' Block Attribute in all versions up to, and including, 5.0.32 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. This is particularly concerning in a cross-privilege scenario where a Contributor creates a pending or draft post containing the malicious block attribute, which then executes arbitrary JavaScript in the browser session of an Editor or Administrator who previews that post.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/ultimate-post/tags/5.0.32/blocks/Adva
- https://plugins.trac.wordpress.org/browser/ultimate-post/tags/5.0.32/blocks/Adva
- https://plugins.trac.wordpress.org/browser/ultimate-post/tags/5.0.32/classes/Blo
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3613430%40ultimate-po
- https://www.wordfence.com/threat-intel/vulnerabilities/id/1f645d0c-d641-4fff-a4f
FAQ
What is CVE-2026-15100?
CVE-2026-15100 is a vulnerability with a CVSS score of 6.4 (MEDIUM). The Post Grid Gutenberg Blocks – PostX plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'searchnoresult' Block Attribute in all versions up to, and including, 5.0.32 due to insuff...
How severe is CVE-2026-15100?
CVE-2026-15100 has been rated MEDIUM with a CVSS base score of 6.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-15100?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.