CVE-2021-40104
HIGHCVSS 7.5/10EPSS 1.28%
Last modified
CVE-2021-40104 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An issue was discovered in Concrete CMS through 8.5.5. There is an SVG sanitizer bypass.. EPSS estimates a 1.28% chance of exploitation in the next 30 days.
Description
An issue was discovered in Concrete CMS through 8.5.5. There is an SVG sanitizer bypass.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Concretecms | Concrete Cms | <= 8.5.5 |
References
- https://documentation.concretecms.org/developers/introduction/version-history/856-release-notesRelease Notes, Vendor Advisory
- https://hackerone.com/reports/1102088Permissions Required, Third Party Advisory
- https://documentation.concretecms.org/developers/introduction/version-history/856-release-notesRelease Notes, Vendor Advisory
- https://hackerone.com/reports/1102088Permissions Required, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-40104?
An issue was discovered in Concrete CMS through 8.5.5. There is an SVG sanitizer bypass.
How severe is CVE-2021-40104?
CVE-2021-40104 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.28% probability of exploitation in the next 30 days.
How do I fix CVE-2021-40104?
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.
Related CVEs from 2021
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Are you affected by CVE-2021-40104?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST