CVE-2026-30662
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Denial of Service in ConcreteCMS File Manager via Memory Exhaustion

Publication date: 2026-03-24

Last updated on: 2026-03-24

Assigner: MITRE

Description
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.
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Meta Information
Published
2026-03-24
Last Modified
2026-03-24
Generated
2026-06-16
AI Q&A
2026-03-24
EPSS Evaluated
2026-06-15
NVD
CVE-2026-30662
EUVD
EUVD-2026-14895
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
concretecms concrete_cms 9.4.7
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.
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Executive Summary

This vulnerability exists in ConcreteCMS version 9.4.7 within its File Manager component. Specifically, the 'download' method in the file 'concrete/controllers/backend/file.php' improperly manages memory when creating zip archives. It uses the 'ZipArchive::addFromString' function 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, causing the system to run out of memory (Out-Of-Memory condition). This leads to the PHP-FPM process terminating unexpectedly (SIGSEGV), and the web server responds with a 500 error.

Impact Analysis

The impact of this vulnerability is a Denial of Service (DoS) condition. An attacker with authentication can cause the web server to crash or become unresponsive by triggering an Out-Of-Memory condition through bulk downloading large files.

This results in the PHP-FPM process terminating and the server returning 500 errors, which disrupts normal service availability and can affect users' ability to access or use the File Manager component.

Compliance Impact

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Mitigation Strategies

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