CVE-2021-28145 json
Concrete CMS Cross-site Scripting via Survey Blocks
published 2021-03-18 5 y ago modified 2026-06-17 4 mo ago also GHSA-7388-7vq2-m4f4 , EUVD-2022-2902
- cvss
- 5.4
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 58%
- public exploits
- 0
- none known
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.
Patch / fix
- packagist concrete5/concrete5 8.5.5
- concretecms concrete_cms 8.5.5
Exploit prediction
0.86% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 3.5 | AV:N/AC:M/Au:S/C:N/I:P/A:N |
| GitHub | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | concrete5/concrete5 | <8.5.5 |
8.5.5 |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
concrete5.org
/developers/security
web, vendor-advisory
-
documentation.concrete5.org
/developers/introduction/version-history/855-release-notes
web, release-notes, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-28145
advisory
-
github.com
/S1lkys/CVE-2021-40101
web
Sources
- CVE List CVE-2021-28145
- GitHub Advisory GHSA-7388-7vq2-m4f4
- NVD CVE-2021-28145
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