CVE-2023-44763
ConcreteCMS vulnerable to Stored Cross-site Scripting
Concrete CMS v9.2.1 is affected by an Arbitrary File Upload vulnerability via a Thumbnail file upload, which allows Cross-Site Scripting (XSS). NOTE: the vendor's position is that a customer is supposed to know that "pdf" should be excluded from the allowed file types, even though pdf is one of the allowed file types in the default configuration.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
Concrete CMS v9.2.1 is affected by an Arbitrary File Upload vulnerability via a Thumbnail file upload, which allows Cross-Site Scripting (XSS). NOTE: the vendor's position is that a customer is supposed to know that "pdf" should be excluded from the allowed file types, even though pdf is one of the allowed file types in the default configuration.
- Record
CVE-2023-44763- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-434
- Updated
- 2026-11-02
CVE List No score
Concrete CMS v9.2.1 is affected by an Arbitrary File Upload vulnerability via a Thumbnail file upload, which allows Cross-Site Scripting (XSS). NOTE: the vendor's position is that a customer is supposed to know that "pdf" should be excluded from the allowed file types, even though pdf is one of the allowed file types in the default configuration.
- Record
CVE-2023-44763- Updated
- 2026-11-02
EUVDEUVD-2023-2833 No score
Concrete CMS v9.2.1 is affected by an Arbitrary File Upload vulnerability via a Thumbnail file upload, which allows Cross-Site Scripting (XSS). NOTE: the vendor's position is that a customer is supposed to know that "pdf" should be excluded from the allowed file types, even though pdf is one of the allowed file types in the default configuration.
- Record
EUVD-2023-2833- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-wrp2-6v6j-hfmg
ConcreteCMS vulnerable to Stored Cross-site Scripting
Concrete CMS v9.2.1 is affected by Arbitrary File Upload vulnerability via the Thumbnail file upload, which allows Cross-Site Scripting (XSS).
- Record
GHSA-wrp2-6v6j-hfmg- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79, CWE-434
- Updated
- 2026-11-02
OSVGHSA-wrp2-6v6j-hfmg
ConcreteCMS vulnerable to Stored Cross-site Scripting
Concrete CMS v9.2.1 is affected by Arbitrary File Upload vulnerability via the Thumbnail file upload, which allows Cross-Site Scripting (XSS).
- Record
GHSA-wrp2-6v6j-hfmg- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-434, CWE-79
- Updated
- 2026-11-02
OSV No score
Concrete CMS v9.2.1 is affected by an Arbitrary File Upload vulnerability via a Thumbnail file upload, which allows Cross-Site Scripting (XSS). NOTE: the vendor's position is that a customer is supposed to know that "pdf" should be excluded from the allowed file types, even though pdf is one of the allowed file types in the default configuration.
- Record
CVE-2023-44763- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
concrete5/concrete5Packagist |
through 9.2.1 | None known |
concrete5/concrete5Packagist |
through 9.2.1, plus listed versions 8.08.0.18.0.28.0.38.1.0 Show 45 moreShow less8.2.08.2.0RC28.2.18.3.08.3.18.3.28.4.08.4.0RC38.4.0RC48.4.18.4.28.4.38.4.48.4.58.5.08.5.0RC18.5.0RC28.5.18.5.108.5.118.5.128.5.138.5.148.5.158.5.168.5.178.5.188.5.198.5.28.5.208.5.218.5.38.5.48.5.58.5.68.5.6RC18.5.78.5.88.5.99.0.09.0.0RC19.0.0RC39.0.0RC49.0.19.0.2 |
None known |
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | sromanhu/CVE-2023-44763_ConcreteCMS-Arbitrary-file-upload-Thumbnail | 2023-09-25 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2023-44763 is a medium vulnerability (CVSS 5.4) in Concretecms Concrete Cms, published October 10, 2023. Its validity is disputed. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.71%, the 54th percentile.
References
github.com/sromanhu/ConcreteCMS-Arbitrary-file-upload-Thumbnail
concretecms.org/about/project-news/security/security-advisory-2023-10-25-concrete-cms-rejects-cve-2023-44763
web.archive.org/web/20231026034159/https://documentation.concretecms.org/user-guide/editors-reference/dashboard/system-and-maintenance/files/allowed-file-types
nvd.nist.gov/vuln/detail/CVE-2023-44763
Left out here: 6 versions. The JSON record has them.