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CVE-2021-28145

MediumPublished

Concrete CMS (formerly concrete5) before 8.5.5 allows remote authenticated users to conduct XSS attacks via a crafted survey block. This requires at least...

Published: Mar 18, 2021
Updated: Aug 3, 2024
Assigning CNA: mitre
Evidence observed: Aug 24, 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

0.9%

Low · next 30 days

Percentile: 56.5%
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 (formerly concrete5) before 8.5.5 allows remote authenticated users to conduct XSS attacks via a crafted survey block. This requires at least Editor privileges.

Sources

CVE-2021-40101Exploit
Survey XSS combined with CSRF leads to Admin Account Takeover in Concrete5 8.5.4

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