CVE-2021-28145
MEDIUMCVSS 5.4/10EPSS 0.86%
Last modified
CVE-2021-28145 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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.. EPSS estimates a 0.86% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Concretecms | Concrete Cms | < 8.5.5 |
References
- https://documentation.concrete5.org/developers/introduction/version-history/855-release-notesRelease Notes, Vendor Advisory
- https://www.concrete5.org/developers/securityVendor Advisory
- https://documentation.concrete5.org/developers/introduction/version-history/855-release-notesRelease Notes, Vendor Advisory
- https://www.concrete5.org/developers/securityVendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-28145?
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.
How severe is CVE-2021-28145?
CVE-2021-28145 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.86% probability of exploitation in the next 30 days.
How do I fix CVE-2021-28145?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-28145?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST