CVE-2026-3240 — Concrete CMS below 9.4.8 is vulnerable to Stored XSS via Legacy form
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 Quest…
Published: 2026-03-04 · CVSS: 4.8 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7