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Vulnerability IntelligenceGHSA-45fj-fvmm-xcc5

GHSA-45fj-fvmm-xcc5

MEDIUM4.8

Concrete CMS has a stored Cross-site Scripting (XSS) vulnerability

Published Mar 4, 2026

Modified 2 days ago

Fix available

Details

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 thanks minhnn42, namdi and quanlna2 from VCSLab-Viettel Cyber Security for reporting.

Affected Packages

concrete5/concrete5

Packagist

Fixed in:

9.4.8

References

WEB

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

ADVISORY

https://github.com/advisories/GHSA-45fj-fvmm-xcc5

PACKAGE

https://github.com/concretecms/concretecms

WEB

https://github.com/concretecms/concretecms/pull/12826

ADVISORY

https://nvd.nist.gov/vuln/detail/CVE-2026-3240

Aliases

CVE-2026-3240

CVSS Analysis

CVSS v4.0

4.8

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Attack Requirements

NoneAT:N

Privileges Required

HighPR:H

User Interaction

PassiveUI:P

Vulnerable System

Vuln. Confidentiality

NoneVC:N

Vuln. Integrity

LowVI:L

Vuln. Availability

NoneVA:N

Subsequent System

Subseq. Confidentiality

NoneSC:N

Subseq. Integrity

NoneSI:N

Subseq. Availability

NoneSA:N

4.8/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

CVE-2026-3240

Ecosystems

Packagist

Timeline

PublishedMar 4, 2026

ModifiedMar 4, 2026

GHSA-45fj-fvmm-xcc5 | Mondoo Vulnerability Intelligence