CVE-2021-47964 Schlix CMS 2.2.6-6 Remote Code Execution via core.blockmanager
Authenticated attackers can execute arbitrary PHP code by uploading malicious extension packages in Schlix CMS.
- 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-2021-47964?
CVE-2021-47964 is a high-severity code injection vulnerability in Schlix CMS, published on 15 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Schlix CMS 2.2.6-6 contains a remote code execution vulnerability that allows authenticated attackers to execute arbitrary PHP code by uploading malicious extension packages through the block manager. Attackers can upload a crafted ZIP file containing PHP code in the packageinfo.inc file and trigger execution by accessing the About tab of the installed extension.
Weakness: CWE-94
Which versions are affected by CVE-2021-47964?
How do I fix CVE-2021-47964?
No fix has been published for CVE-2021-47964 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2021-47964 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47964 exists.
Sources
Also known as GHSA-r3mq-4wxp-p8vq.