CVE-2026-15100 Cross-site scripting in Post Grid Gutenberg Blocks – PostX
Authenticated contributors can inject malicious scripts via the searchnoresult block attribute, potentially compromising editor or administrator sessions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-15100?
CVE-2026-15100 is a medium-severity cross-site scripting vulnerability in wpxpo Post Grid Gutenberg Blocks – PostX, published on 24 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-15100?
How do I fix CVE-2026-15100?
No fix has been published for CVE-2026-15100 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-15100 being exploited?
There is no known exploitation of CVE-2026-15100 in the wild and no public exploit code.
Sources
Also known as GHSA-vrqp-vqfm-w2jv.