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CVE-2026-3242 - Vulnerability Analysis

MediumCVSS: 4.8

Last Updated: March 4, 2026

Concrete CMS - Stored XSS

Published: March 4, 2026Updated: March 4, 2026PoC AvailableRemote Exploitable

Overview

Concrete CMS < 9.4.8 contains a stored XSS vulnerability caused by improper sanitization in the Switch Language block, letting rogue administrators execute scripts, exploit requires administrator privileges.

Severity & Score

Severity: Medium

CVSS Score: 4.8

Impact

Rogue administrators can execute persistent scripts, potentially affecting other users and compromising session integrity.

Mitigation

Update to version 9.4.8 or later.

References

https://documentation.concretecms.org/9-x/developers/introduction/version-history/948-release-notes
https://github.com/concretecms/concretecms/pull/12826

Related Resources

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Details

CVE ID: CVE-2026-3242
Severity: Medium
CVSS Score: 4.8
Type: stored_xss
Status: confirmed

CWE

CWE-79

CVSS Metrics

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N