GHSA-296q-rj83-g9rq: XSS

First published: Fri Jul 26 2024(Updated: )

## usd-2024-0009 | Reflected XSS in Oveleon Cookiebar ### Details **Advisory ID**: usd-2024-0009 **Product**: Cookiebar **Affected Version**: 2.X **Vulnerability Type**: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') **Security Risk**: HIGH, CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N **Vendor URL**: https://www.usd.de/ **CVE Number**: Not requested yet **CVE Link**: Not requested yet ### Affected Component The `block` function in `CookiebarController.php`. ### Desciption Oveleon's Cookiebar is an extension for the popular Contao CMS. The `block/locale` endpoint does not properly sanitize the user-controlled `locale` input before including it in the backend's HTTP response, thereby causing reflected XSS. ### Fix Sanitize the `locale` input to prevent XSS payloads from being executed in a user's browser. ### Timeline * **2024-04-24**: Vulnerability discovered by Daniel Ruppel of usd AG. * **2024-07-25**: Probable cause of the vulnerability has been identified as Oveleon's Cookiebar Extension for Contao CMS. * **2024-07-25**: Vulnerability disclosed via GitHub Vulnerability Report.

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