What is the CVSS score of CVE-2026-3242?

CVE-2026-3242 has a CVSS 3.1 base score of 4.8 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Concrete Cms are affected by CVE-2026-3242?

Organizations using Concrete CMS below should be aware of moderate risk from CVE-2026-3242, a cross-site scripting vulnerability rated CVSS 4.8.. A patch is available.

Is there a public PoC exploit available for CVE-2026-3242?

Yes, a public proof-of-concept exploit is available for CVE-2026-3242. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-3242?

Within 30 days: Identify affected systems running Concrete CMS below and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Concrete Cms CVE-2026-3242

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-03-04 ff5b8ace-8b95-4078-9743-eac1ca5451de

GHSA-w9qg-chfh-g3q9

XSS Concrete Cms

4.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

4.8 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:05 vuln.today

PoC Detected

Mar 04, 2026 - 21:31 vuln.today

Public exploit code

Patch released

Mar 04, 2026 - 21:31 nvd

Patch available

CVE Published

Mar 04, 2026 - 03:16 nvd

MEDIUM 4.8

DescriptionCVE.org

In Concrete CMS below version 9.4.8, a rogue administrator can add stored XSS via the Switch Language block. 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 M3dium for reporting.

AnalysisAI

Stored XSS in Concrete CMS versions before 9.4.8 allows authenticated administrators to inject malicious scripts through the Switch Language block, affecting any site where a rogue admin account exists. Public exploit code is available for this vulnerability. A patch is available in version 9.4.8 and later.

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Concrete Cms. In Concrete CMS below version 9.4.8, a rogue administrator can add stored XSS via the Switch Language block. 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 M3dium for reporting.

RemediationAI

A vendor patch is available — apply it immediately. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.