CVE-2026-15420 Path traversal in Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder
Authenticated subscribers can delete arbitrary CSS/JS files via path traversal, causing denial of service or asset destruction in Nexter Blocks.
- 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-2026-15420?
CVE-2026-15420 is a medium-severity path traversal vulnerability in posimyththemes Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder, published on 24 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder plugin for WordPress is vulnerable to Directory Traversal in all versions up to, and including, 5.0.0 via the 'plus_name' parameter. This makes it possible for authenticated attackers, with subscriber-level access and above, to delete arbitrary JS/CSS files on the server, which can lead to denial of service or destruction of critical plugin and theme assets.
Weakness: CWE-22
Which versions are affected by CVE-2026-15420?
How do I fix CVE-2026-15420?
No fix has been published for CVE-2026-15420 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-15420 being exploited?
There is no known exploitation of CVE-2026-15420 in the wild and no public exploit code.
Sources
Also known as GHSA-cg9r-cc95-vm62.