Concrete CMS (previously concrete5) versions 8.5.12 and below, and versions 9.0 through…
Priority LOW 28CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
Concrete CMS (previously concrete5) versions 8.5.12 and below, and versions 9.0 through 9.1.3 is vulnerable to Reflected XSS on the Reply form because msgID was not sanitized.
Why it matters now
EPSS 0.00642 51st percentileScored 2026-11-07
Fix Fixed concrete5/concrete5 (Packagist): 9.2.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | concrete5/concrete5 (Packagist) | before 9.2.0 | 9.2.0 | Patch available | GHSA-vcpr-hm2m-gjjj |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- concrete5/concrete5 (Packagist) Vendor— Affected before 9.2.0 Fixed in 9.2.0 Patch available GHSA-vcpr-hm2m-gjjj
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:* | before 9.2.0 | Vulnerable | Concrete CMS |
- cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:* Versions before 9.2.0 Vulnerable ·Concrete CMS
Remediation
- Fix · GHSA-vcpr-hm2m-gjjj concrete5/concrete5 (Packagist) Fixed in 9.2.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2023-28475
- 2026-10-03 Alias added: GHSA-vcpr-hm2m-gjjj
- 2026-10-21 EPSS moved to the 50th–90th percentile
References
Advisory 2
More Concrete Cms vulnerabilities
- TI-2026-23602 ConcreteCMS v9.4.7 contains a Denial of Service (DoS) vulnerability in the File Manager… CVSS 3.1MEDIUM 6.5
- TI-2023-23992 A Cross Site Scripting (XSS) vulnerability in Concrete CMS from versions 9.2.0 to 9.2.2… CVSS 3.1MEDIUM 5.4
- TI-2023-26495 Concrete CMS before 8.5.13 and 9.x before 9.2.2 allows unauthorized access because… CVSS 3.1CRITICAL 9.8
- TI-2026-14907 Missing authorization in Concrete CMS CVSS 4.0HIGH 8.7
- TI-2022-06200 Cleartext transmission of sensitive information in https://github.com/concrete5/concrete5 CVSS 3.1CRITICAL 9.8
- TI-2021-17294 An issue was discovered in Concrete CMS through 8.5.5. CVSS 3.1CRITICAL 9.8
Sources
- CVE-2023-28475 · CVE Program
- CVE-2023-28475 · NVD
- FIRST EPSS
- GHSA-vcpr-hm2m-gjjj · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences