CVE-2026-3240
Medium · 4.8CVSS
4.8
EPSS
0.3%
Published
Mar 4, 2026
CISA due date
—
The record
In Concrete CMS below version 9.4.8, a user with permission to edit a page with element Legacy form can perform a stored XSS attack towards high-privilege accounts via the Question field. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 4.8 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N Thanks minhnn42, namdi and quanlna2 from VCSLab-Viettel Cyber Security for reporting.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Packagist | concrete5/concrete5 | 0 | 9.4.8 |
Related vulnerabilities
- GHSA-45fj-fvmm-xcc5 Concrete CMS has a stored Cross-site Scripting (XSS) vulnerability Same vulnerability
- GHSA-w9qg-chfh-g3q9 Concrete CMS has a stored Cross-site Scripting (XSS) vulnerability Also affects concrete5/concrete5
- GHSA-6mxw-2vhf-42g5 Concrete CMS vulnerable to Cross-Site Request Forgery (CSRF) Also affects concrete5/concrete5
- GHSA-f4vq-pj32-gr4q Concrete CMS has a stored Cross-site Scripting (XSS) vulnerability Also affects concrete5/concrete5
- GHSA-gj26-w59c-29mf Concrete CMS vulnerable to Remote Code Execution by stored PHP object injection Also affects concrete5/concrete5
- GHSA-mm5f-5rqw-574f Concrete CMS has a stored Cross-site Scripting (XSS) vulnerability Also affects concrete5/concrete5
- CVE-2026-3241 In Concrete CMS below version 9.4.8, a stored cross-site scripting (XSS) vulnerability… Also affects concrete5/concrete5
- CVE-2026-3242 In Concrete CMS below version 9.4.8, a rogue administrator can add stored XSS via the… Also affects concrete5/concrete5