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

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

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.