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

TRUNG BÌNH 4.8CVE-2026-3241 · GHSA-f4vq-pj32-gr4q · Công bố 04/03/2026 · cập nhật 17/06/2026

Tóm tắt nhanh

CVE-2026-3241 là lỗ hổng mức TRUNG BÌNH (CVSS 4.8) ảnh hưởng concrete5/concrete5, concrete cms (concretecms).
Xác suất bị khai thác trong 30 ngày tới (EPSS): 0.24%, cao hơn 14.9% các lỗ hổng khác.
Cách xử lý: cập nhật lên 9.4.8 hoặc mới hơn.

Gói / sản phẩm	Phiên bản bị ảnh hưởng	Phiên bản đã vá
concrete5/concrete5 Packagist	`< 9.4.8`	`9.4.8`
concrete cms concretecms	`< 9.4.8`	`9.4.8`

Mô tả

In Concrete CMS below version 9.4.8, a 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 thanks M3dium for reporting.

Mô tả của NVD

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.