CVE-2026-3241
Description
In Concrete CMS below version 9.4.8, a stored 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 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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
concrete5/concrete5Packagist | < 9.4.8 | 9.4.8 |
Affected products
3- Range: 5
Patches
Vulnerability mechanics
References
4- documentation.concretecms.org/9-x/developers/introduction/version-history/948-release-notesnvdPatchRelease NotesVendor AdvisoryWEB
- github.com/concretecms/concretecms/pull/12826nvdExploitIssue TrackingVendor AdvisoryWEB
- github.com/advisories/GHSA-f4vq-pj32-gr4qghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-3241ghsaADVISORY
News mentions
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