# CVE-2026-15100: WPXPO PostX Stored XSS in searchnoresult block attribute

Source: https://junglewise.ai/threats/cve-2026-15100-wpxpo-postx-stored-xss-in-searchnoresult-block-attribute  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-24. Updated: 2026-07-24  
License: CC BY 4.0 with a link back

CVE-2026-15100 · Severity: medium · CVSS 6.4 · Published 2026-07-24

The PostX plugin for WordPress, which provides advanced layout blocks for website design, contains a security flaw that allows users with contributor-level access to inject malicious scripts into pages. This is particularly dangerous because a low-privileged user could create a draft post that, when previewed by a site administrator, executes code in the administrator's browser. This could lead to unauthorized site modifications or the theft of sensitive administrative session information.

Vendors: [WPXPO](https://junglewise.ai/threats/vendors/wpxpo).

## Quick answers

**Is CVE-2026-15100 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-15100 being exploited in the wild.

**How severe is CVE-2026-15100?** Medium severity, with a CVSS score of 6.4, published 24 July 2026.

**Which products and versions are affected?** WPXPO Post Grid Gutenberg Blocks – PostX up to, and including, 5.0.32.

**Is there a fix for CVE-2026-15100?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-15100 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-15100?** Check whether you run WPXPO Post Grid Gutenberg Blocks – PostX at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The Post Grid Gutenberg Blocks – PostX plugin for WordPress is vulnerable to Stored Cross-Site Scripting (XSS) due to insufficient input sanitization and output escaping on the 'searchnoresult' block attribute. An authenticated attacker with at least Contributor-level permissions can inject malicious JavaScript into a block. When an Editor or Administrator previews or views the post containing this block, the script executes within their browser context. This cross-privilege escalation vector can be used to perform actions on behalf of the administrator. The vulnerability is present in all versions up to and including 5.0.32.

## Affected products

- WPXPO Post Grid Gutenberg Blocks – PostX up to, and including, 5.0.32

## Timeline

- 2026-07-24: disclosed
- 2026-07-24: advisory

## References

- [https://plugins.trac.wordpress.org/browser/ultimate-post/tags/5.0.32/blocks/Advanced_Search.php](https://plugins.trac.wordpress.org/browser/ultimate-post/tags/5.0.32/blocks/Advanced_Search.php)
- [https://plugins.trac.wordpress.org/browser/ultimate-post/tags/5.0.32/blocks/Advanced_Search.php](https://plugins.trac.wordpress.org/browser/ultimate-post/tags/5.0.32/blocks/Advanced_Search.php)
- [https://plugins.trac.wordpress.org/browser/ultimate-post/tags/5.0.32/classes/Blocks.php](https://plugins.trac.wordpress.org/browser/ultimate-post/tags/5.0.32/classes/Blocks.php)
- [https://plugins.trac.wordpress.org/changeset?reponame=&old=3613430%40ultimate-post&new=3613430%40ultimate-post](https://plugins.trac.wordpress.org/changeset?reponame=&old=3613430%40ultimate-post&new=3613430%40ultimate-post)
- [https://www.wordfence.com/threat-intel/vulnerabilities/id/1f645d0c-d641-4fff-a4f4-33c037de30e9?source=cve](https://www.wordfence.com/threat-intel/vulnerabilities/id/1f645d0c-d641-4fff-a4f4-33c037de30e9?source=cve)

## Related threats

- [WPXPO Ultimate Post Stored XSS in Advanced Search Block](https://junglewise.ai/threats/cve-2026-13253-wpxpo-ultimate-post-stored-xss-in-advanced-search-block)