PostX searchnoresult attribute permits contributor stored XSS
PostX through 5.0.32 stores a contributor-controlled searchnoresult Advanced Search block attribute and later inserts it into data-noresultext without attribute-context escaping. wp_kses() alone does not make the value safe for that attribute, so script can run for visitors or an Editor/Administrator previewing the contributor's draft or pending post.
- Component
- Post Grid Gutenberg Blocks – PostX
- Plugin slug
ultimate-post- Affected
- <= 5.0.32
- Safe version
5.0.33- Published
- Jul 24, 2026
This CVE was published Jul 24, 2026 and is one of 16 known issues for this plugin.
Update, patch or deactivate.
Update PostX to 5.0.33 or later. The minimal application patch is to pass searchnoresult through esc_attr() at the data-noresultext output boundary, as the vendor now does. Review untrusted Advanced Search blocks and remove unexpected encoded markup.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical 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.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N