CVE-2026-15100
Post Grid Gutenberg Blocks <= 5.0.32 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'searchnoresult' Block Attribute
- Published
- Updated
- Reserved
- Assigned by
- Wordfence
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| WordfenceCNA (assigner) | 3.1 | Medium6.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
| NVDNVD · Deferred | 3.1 | Medium6.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.33% · top 74% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.4.
Weakness
Affected products
wpxpo · Post Grid Gutenberg Blocks – PostX
- affected ≤ 5.0.32
References (5)
- https://www.wordfence.com/threat-intel/vulnerabilities/id/1f645d0c-d641-4fff-a4f4-33c037de30e9?source=cve (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/ultimate-post/tags/5.0.32/blocks/Advanced_Search.php#L116 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/ultimate-post/tags/5.0.32/blocks/Advanced_Search.php#L107 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/ultimate-post/tags/5.0.32/classes/Blocks.php#L231 (opens in a new tab)
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3613430%40ultimate-post&new=3613430%40ultimate-post (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-15100)Record last updated .