CVE-2021-40104
An issue was discovered in Concrete CMS through 8.5.5. There is an SVG sanitizer bypass.
An issue was discovered in Concrete CMS through 8.5.5. There is an SVG sanitizer bypass.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
An issue was discovered in Concrete CMS through 8.5.5. There is an SVG sanitizer bypass.
- Record
CVE-2021-40104- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:P/A:N - Updated
- 2026-11-02
CVE ListNo score
An issue was discovered in Concrete CMS through 8.5.5. There is an SVG sanitizer bypass.
- Record
CVE-2021-40104- Updated
- 2026-11-02
EUVDEUVD-2021-27293No score
An issue was discovered in Concrete CMS through 8.5.5. There is an SVG sanitizer bypass.
- Record
EUVD-2021-27293- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-jh36-7vgg-mwm2
An issue was discovered in Concrete CMS through 8.5.5. There is an SVG sanitizer bypass.
An issue was discovered in Concrete CMS through 8.5.5. There is an SVG sanitizer bypass.
- Record
GHSA-jh36-7vgg-mwm2- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-863
- Updated
- 2026-11-02
OSV
An issue was discovered in Concrete CMS through 8.5.5. There is an SVG sanitizer bypass.
- Record
CVE-2021-40104- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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-2021-40104 is a high vulnerability (CVSS 7.5) 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 1.38%, the 72nd percentile. No source names a fixed version.