CVE-2026-30662
published 2026-03-24CVE-2026-30662: ConcreteCMS v9.4.7 contains a Denial of Service (DoS) vulnerability in the File Manager component. The 'download' method in…
PriorityP335medium6.5CVSS 3.1
AVNACLPRLUINSUCNINAH
EPSS
0.29%
20.5th percentile
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
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| concrete5 | concrete5 | 0 – 9.4.7 | — |
| concretecms | concrete_cms | — | — |
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GHSA
ConcreteCMS is vulnerable to Denial of Service During Bulk Downloads
ghsa·2026-03-24
CVE-2026-30662 [MEDIUM] CWE-770 ConcreteCMS is vulnerable to Denial of Service During Bulk Downloads
ConcreteCMS is vulnerable to Denial of Service During Bulk Downloads
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.
OSV
ConcreteCMS is vulnerable to Denial of Service During Bulk Downloads
osv·2026-03-24
CVE-2026-30662 [MEDIUM] ConcreteCMS is vulnerable to Denial of Service During Bulk Downloads
ConcreteCMS is vulnerable to Denial of Service During Bulk Downloads
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.
No detection rules found.
No public exploits indexed.
2026-03-24
Published