GitHub Advisoryadvisory · Packagist

GHSA-f4vq-pj32-gr4q Concrete CMS has a stored Cross-site Scripting (XSS) vulnerability

MEDIUM Published 2026-03-04 Modified 2026-03-04 Official page ↗
Aliases
CVE-2026-3241
Ecosystem
Packagist
Packages
concrete5/concrete5
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Weaknesses
CWE-79
Reviewed
2026-03-04

Affected packages

• Packagist concrete5/concrete5: < 9.4.8 → fixed in 9.4.8

Description

In Concrete CMS below version 9.4.8, a Cross-site Scripting (XSS) vulnerability exists in the "Legacy Form" block. An authenticated user with permissions to create or edit forms (e.g., a rogue administrator) can inject a persistent JavaScript payload into the options of a multiple-choice question (Checkbox List, Radio Buttons, or Select Box). This payload is then executed in the browser of any user who views the page containing the form.  The Concrete CMS security team thanks M3dium for reporting.

Related

Alias · CVE (1)

  • CVE-2026-3241 In Concrete CMS below version 9.4.8, a stored cross-site scripting (XSS) vulnerability exists in the "Legacy Form" block. vulnerability

Weakness · CWE (1)

  • CWE-79 Improper Neutralization of Input During Web Page Generation weakness

References