medium6.5
CVE-2026-30662
ConcreteCMS v9.4.7 contains a Denial of Service (DoS) vulnerability in the File Manager component.
Impact
ConcreteCMS v9.4.7 contains a Denial of Service (DoS) vulnerability in the File Manager component. The 'download' method in 'concrete/controllers/backend/file.php' improperly manages memory when creating zip archives. It uses 'ZipArchive::addFromString' combined with 'file_get_contents', which loads the entire content of every selected file into PHP memory. An authenticated attacker can exploit this by requesting a bulk download of large files, triggering an Out-Of-Memory (OOM) condition that causes the PHP-FPM process to terminate (SIGSEGV) and the web server to return a 500 error.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | concrete5/concrete5 | <= 9.4.7 | none recorded |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Concretecms | Concrete Cms | Version 9.4.7 |