CVE-2026-11426 UnderConstructionPage PRO <= 5.76 - Authenticated (Subscriber+) Arbitrary File Read via template_thumbnail Parameter
Authenticated subscribers can read arbitrary server files via the template_thumbnail parameter in the UnderConstructionPage PRO WordPress plugin.
- 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-2026-11426?
CVE-2026-11426 is a medium-severity path traversal vulnerability in WebFactory Under Construction Page (Pro), published on 11 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The UnderConstructionPage PRO plugin for WordPress is vulnerable to Arbitrary File Read in all versions up to, and including, 5.76. This is due to the plugin accepting arbitrary local file paths in the template_thumbnail parameter and copying their contents into a publicly accessible uploads file. This makes it possible for authenticated attackers, with Subscriber-level access and above, to read arbitrary files on the server, which can contain sensitive information.
Weakness: CWE-22
Which versions are affected by CVE-2026-11426?
How do I fix CVE-2026-11426?
No fix has been published for CVE-2026-11426 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-2026-11426 being exploited?
There is no known exploitation of CVE-2026-11426 in the wild and no public exploit code.
Sources
Also known as GHSA-wcfj-4phh-x3w3.