CVE-2026-10833 Cross-site scripting in Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns
Authenticated contributors can inject arbitrary scripts via the configurablePrefix attribute, leading to stored XSS execution for other users.
- 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-2026-10833?
CVE-2026-10833 is a medium-severity cross-site scripting vulnerability in wpdevteam Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns, published on 25 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'configurablePrefix' Block Attribute in all versions up to, and including, 6.1.4 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-10833?
How do I fix CVE-2026-10833?
No fix has been published for CVE-2026-10833 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-2026-10833 being exploited?
There is no known exploitation of CVE-2026-10833 in the wild and no public exploit code.
Sources
Also known as GHSA-298j-vh9r-mc78.