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CVE-2023-44763

MediumPublished

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...

Published: Oct 10, 2023
Updated: Aug 2, 2024
Assigning CNA: mitre
Evidence observed: Aug 4, 2026

Primary CVSS

5.4/ 10Medium

nvd · CVSS 3.1

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

EPSS probability estimate

0.6%

Low · next 30 days

Percentile: 46.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2023-44763_ConcreteCMS-Arbitrary-file-upload-ThumbnailPoC
ConcreteCMS v.9.2.1 is affected by Arbitrary File Upload vulnerability that allows Cross-Site Scriting (XSS) Stored.

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