CVE-2023-44763

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-10-10 · updated 2026-06-17
Weakness: CWE-434

Description

Concrete CMS v9.2.1 is affected by an Arbitrary File Upload vulnerability via a Thumbnail file upload, which allows Cross-Site Scripting (XSS). NOTE: the vendor's position is that a customer is supposed to know that "pdf" should be excluded from the allowed file types, even though pdf is one of the allowed file types in the default configuration.

Affected products

Concrete CMS: 9.2.1

References

https://github.com/sromanhu/ConcreteCMS-Arbitrary-file-upload-Thumbnail
https://web.archive.org/web/20231026034159/https://documentation.concretecms.org/user-guide/editors-reference/dashboard/system-and-maintenance/files/allowed-file-types
https://www.concretecms.org/about/project-news/security/security-advisory-2023-10-25-concrete-cms-rejects-cve-2023-44763
https://github.com/sromanhu/ConcreteCMS-Arbitrary-file-upload-Thumbnail
https://web.archive.org/web/20231026034159/https://documentation.concretecms.org/user-guide/editors-reference/dashboard/system-and-maintenance/files/allowed-file-types
https://www.concretecms.org/about/project-news/security/security-advisory-2023-10-25-concrete-cms-rejects-cve-2023-44763

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