CVE-2026-30662Public exploitNetwork attack vector

Authenticated service interruption via memory-heavy ZIP creation

Published Mar 24, 2026 · Updated Mar 24, 2026

Denial of service in Concrete CMS 9.4.7 File Manager allows remote authenticated users to interrupt service via bulk file downloads. The download method in concrete/controllers/backend/file.php passes each complete selected file from getFileContents() to ZipArchive::addFromString, retaining archive data in PHP memory. File Manager access and multiple large readable files are required; exceeding PHP's memory limit crashes a PHP-FPM worker, and repeated requests can exhaust the process pool.

CVSS severity6.5
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Concrete CMS 9.4.7 File Manager allows remote authenticated users to interrupt service via bulk file downloads. The download method in concrete/controllers/backend/file.php passes each complete selected file from getFileContents() to ZipArchive::addFromString, retaining archive data in PHP memory. File Manager access and multiple large readable files are required; exceeding PHP's memory limit crashes a PHP-FPM worker, and repeated requests can exhaust the process pool.

The record

CVE
CVE-2026-30662
Published
Mar 24, 2026
Updated
Mar 24, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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