CVE-2026-30662

ConcreteCMS v9.4.7 contains a Denial of Service (DoS) vulnerability in the File Manager component

Medium · published March 24, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
38.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00456 · 38.6th percentile
Published
2026-03-24T00:00Z
EPSS history
Timeline
  • 24 MAR 00:00Z
    ConcreteCMS v9.4.7 contains a Denial of Service (DoS) vulnerability in the File Manager component
    cvelistv5