CVE-2021-40106
An issue was discovered in Concrete CMS through 8.5.5. There is unauthenticated stored XSS in...
An issue was discovered in Concrete CMS through 8.5.5. There is unauthenticated stored XSS in blog comments via the website field.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
An issue was discovered in Concrete CMS through 8.5.5. There is unauthenticated stored XSS in blog comments via the website field.
- Record
CVE-2021-40106- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
CVE ListNo score
An issue was discovered in Concrete CMS through 8.5.5. There is unauthenticated stored XSS in blog comments via the website field.
- Record
CVE-2021-40106- Updated
- 2026-11-02
EUVDEUVD-2021-27295No score
An issue was discovered in Concrete CMS through 8.5.5. There is unauthenticated stored XSS in blog comments via the website field.
- Record
EUVD-2021-27295- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-95f3-pf4g-7m5qNo score
An issue was discovered in Concrete CMS through 8.5.5. There is unauthenticated stored XSS in...
An issue was discovered in Concrete CMS through 8.5.5. There is unauthenticated stored XSS in blog comments via the website field.
- Record
GHSA-95f3-pf4g-7m5q- Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
An issue was discovered in Concrete CMS through 8.5.5. There is unauthenticated stored XSS in blog comments via the website field.
- Record
CVE-2021-40106- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-40106 is a medium vulnerability (CVSS 6.1) in Concretecms Concrete Cms, published September 27, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.65%, the 51st percentile. No source names a fixed version.