CVE-2026-54416 Pluck CMS - Unrestricted File Upload via Missing .php8 Extension in Upload Blacklist
Attackers can upload malicious PHP files by using extensions like .php8, bypassing the blacklist to execute arbitrary code on the server.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-54416?
CVE-2026-54416 is a high-severity vulnerability in pluck-cms Pluck CMS, published on 5 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Pluck CMS through 4.7.21 restricts dangerous file uploads in its admin file-management feature using a fixed blacklist in data/inc/files.php ('.php','php3','php4','php5','php6','php7','phtml','.phtm','.pht','.ph3','.ph4','.ph5','.asp','.cgi','.phar'), checked against the last 4-5 characters of the filename.
Weakness: CWE-434
Which versions are affected by CVE-2026-54416?
How do I fix CVE-2026-54416?
No fix has been published for CVE-2026-54416 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-54416 being exploited?
There is no known exploitation of CVE-2026-54416 in the wild and no public exploit code.
Sources
Also known as GHSA-fvwx-9qcr-crph.