TI-2021-05829 Aliases CVE-2021-22968 GHSA-g3p2-hfqr-9m25

Unrestricted file upload in https://github.com/concrete5/concrete5

LOW 37CWE-98Published 2021-11-19 · Updated 2024-08-03

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-98.

Summary

A bypass of adding remote files in Concrete CMS (previously concrete5) File Manager leads to remote code execution in Concrete CMS (concrete5) versions 8.5.6 and below.The external file upload feature stages files in the public directory even if they have disallowed file extensions. They are stored in a directory with a random name, but it's possible to stall the uploads and brute force the directory name. You have to be an admin with the ability to upload files, but this bug gives you the ability to upload restricted file types and execute them depending on server configuration.To fix this, a check for allowed file extensions was added before downloading files to a tmp directory.Concrete CMS Security Team gave this a CVSS v3.1 score of 5.4 AV:N/AC:H/PR:H/UI:R/S:C/C:N/I:H/A:NThis fix is also in Concrete version 9.0.0

Why it matters now

EPSS 0.03235 88th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed concrete5/core (Packagist): 8.5.7

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	https://github.com/concrete5/concrete5	Concrete CMS version 9.0 and version 8.5.7	—	No fix listed	CNA
—	concrete5/core (Packagist)	before 8.5.7	8.5.7	Patch available	GHSA-g3p2-hfqr-9m25

https://github.com/concrete5/concrete5 Vendor— Affected Concrete CMS version 9.0 and version 8.5.7 Fixed in — No fix listed CNA
concrete5/core (Packagist) Vendor— Affected before 8.5.7 Fixed in 8.5.7 Patch available GHSA-g3p2-hfqr-9m25

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:concretecms:concrete_cms::::::::	before 8.5.7	Vulnerable	Concrete CMS

cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:* Versions before 8.5.7 Vulnerable ·Concrete CMS

Remediation

Fix · GHSA-g3p2-hfqr-9m25 concrete5/core (Packagist) Fixed in 8.5.7 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2021-22968
2026-10-03 Alias added: GHSA-g3p2-hfqr-9m25

References

Exploit 1

https://hackerone.com/reports/1350444

Advisory 2

Other 1

https://github.com/olsgreen/concrete5-core

TI-2026-23602 ConcreteCMS v9.4.7 contains a Denial of Service (DoS) vulnerability in the File Manager… CVSS 3.1MEDIUM 6.5
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

See all 197 →

Sources

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