CVE-2021-40105
An issue was discovered in Concrete CMS through 8.5.5. There is XSS via Markdown Comments.
An issue was discovered in Concrete CMS through 8.5.5. There is XSS via Markdown Comments.
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 XSS via Markdown Comments.
- Record
CVE-2021-40105- 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 XSS via Markdown Comments.
- Record
CVE-2021-40105- Updated
- 2026-11-02
EUVDEUVD-2021-27294No score
An issue was discovered in Concrete CMS through 8.5.5. There is XSS via Markdown Comments.
- Record
EUVD-2021-27294- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-5x56-gcx7-98rhNo score
An issue was discovered in Concrete CMS through 8.5.5. There is XSS via Markdown Comments.
An issue was discovered in Concrete CMS through 8.5.5. There is XSS via Markdown Comments.
- Record
GHSA-5x56-gcx7-98rh- Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
An issue was discovered in Concrete CMS through 8.5.5. There is XSS via Markdown Comments.
- Record
CVE-2021-40105- 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-2021-40105 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.