CVE-2026-13458 Cross-site scripting in GenerateBlocks
Authenticated contributors can inject arbitrary scripts via dynamic tags in HTML attributes, 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-2026-13458?
CVE-2026-13458 is a medium-severity cross-site scripting vulnerability in edge22 GenerateBlocks, published on 1 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The GenerateBlocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Dynamic Tag Injection in HTML Attributes in all versions up to, and including, 2.3.0 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. A Contributor-level attacker can store the malicious payload by placing a dynamic tag such as {{post_meta key:...}} in a non-URL HTML attribute (e.g., title, aria-label, alt, or data-* attributes) of a GenerateBlocks element block, then setting the corresponding unprotected post meta key via the Custom Fields metabox to a value containing a closing quote and an injected event-handler attribute.
Weakness: CWE-79
Which versions are affected by CVE-2026-13458?
How do I fix CVE-2026-13458?
No fix has been published for CVE-2026-13458 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-2026-13458 being exploited?
There is no known exploitation of CVE-2026-13458 in the wild and no public exploit code.
Sources
Also known as GHSA-vxv6-p94x-jpx2.