CVE-2026-4509 PbootCMS File Upload file.php incomplete blacklist
Attackers can upload malicious files due to an incomplete blacklist in PbootCMS, potentially leading to remote code execution.
- 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-2026-4509?
CVE-2026-4509 is a medium-severity vulnerability in PbootCMS, published on 21 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A security flaw has been discovered in PbootCMS up to 3.2.12. This affects an unknown function of the file core/function/file.php of the component File Upload. The manipulation of the argument black results in incomplete blacklist. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks.
Which versions are affected by CVE-2026-4509?
How do I fix CVE-2026-4509?
No fix has been published for CVE-2026-4509 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-4509 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4509 exists.
Sources
Also known as GHSA-w42h-9gvx-cgmj.