CVE-2026-30662 — MEDIUM (6.5)

Vulnerability 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.

CVSS Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Concretecms	Concrete Cms	9.4.7

Related Weaknesses (CWE)

CWE-400

References

https://wang1rrr.github.io/2026/02/11/CVE-Report-ConcreteCMS-DoS/ExploitThird Party Advisory

FAQ

What is CVE-2026-30662?

CVE-2026-30662 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 creat...

How severe is CVE-2026-30662?

CVE-2026-30662 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-30662?

Check the references section above for vendor advisories and patch information. Affected products include: Concretecms Concrete Cms.