TI-2026-23602 Aliases CVE-2026-30662 GHSA-p68c-rmfh-j48h

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

MEDIUM 62CWE-400Published 2026-03-24 · Updated 2026-03-24

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and GitHub. Impact type from CWE-400.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00299 22nd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA
—	concrete5/concrete5 (Packagist)	up to 9.4.7	—	No fix listed	GHSA-p68c-rmfh-j48h

— Vendor— Affected all versions Fixed in — No fix listed CNA
concrete5/concrete5 (Packagist) Vendor— Affected up to 9.4.7 Fixed in — No fix listed GHSA-p68c-rmfh-j48h

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:concretecms:concrete_cms:9.4.7:::::::*	9.4.7	Vulnerable	Concrete CMS

cpe:2.3:a:concretecms:concrete_cms:9.4.7:*:*:*:*:*:*:* Versions 9.4.7 Vulnerable ·Concrete CMS

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-30662
2026-10-03 Alias added: GHSA-p68c-rmfh-j48h

References

Exploit 1

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

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-30662

Other 2

TI-2023-23992 A Cross Site Scripting (XSS) vulnerability in Concrete CMS from versions 9.2.0 to 9.2.2… CVSS 3.1MEDIUM 5.4
TI-2023-26495 Concrete CMS before 8.5.13 and 9.x before 9.2.2 allows unauthorized access because… CVSS 3.1CRITICAL 9.8
TI-2026-14907 Missing authorization in Concrete CMS CVSS 4.0HIGH 8.7
TI-2022-06200 Cleartext transmission of sensitive information in https://github.com/concrete5/concrete5 CVSS 3.1CRITICAL 9.8
TI-2021-17294 An issue was discovered in Concrete CMS through 8.5.5. CVSS 3.1CRITICAL 9.8
TI-2021-05819 Server-side request forgery in https://github.com/concrete5/concrete5 CVSS 3.1CRITICAL 9.8

See all 197 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences