CVE-2025-31138: tarteaucitron.js allows UI manipulation via unrestricted CSS injection
A vulnerability was identified in tarteaucitron.js, where user-controlled inputs for element dimensions (width and height) were not properly validated. This allowed an attacker with direct access to the site's source code or a CMS plugin to set values like 100%;height:100%;position:fixed;, potentially covering the entire viewport and facilitating clickjacking attacks.
Impact An attacker with high privileges could exploit this vulnerability to: - Overlay malicious UI elements on top of legitimate content, - Trick users into interacting with hidden elements (clickjacking), - Disrupt the intended functionality and accessibility of the website.
Fix https://github.com/AmauriC/tarteaucitron.js/commit/25fcf828aaa55306ddc09cfbac9a6f8f126e2d07 The issue was resolved by enforcing strict validation and sanitization of user-provided CSS values to prevent unintended UI manipulation.
Other sources
tarteaucitron.js is a compliant and accessible cookie banner. A vulnerability was identified in tarteaucitron.js prior to 1.20.1, where user-controlled inputs for element dimensions (width and height) were not properly validated. This allowed an attacker with direct access to the site's source code or a CMS plugin to set values like 100%;height:100%;position:fixed;, potentially covering the entire viewport and facilitating clickjacking attacks. An attacker with high privileges could exploit this vulnerability to overlay malicious UI elements on top of legitimate content, trick users into interacting with hidden elements (clickjacking), or disrupt the intended functionality and accessibility of the website. This vulnerability is fixed in 1.20.1.
— MITRE
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2025-31138?
CVE-2025-31138 has been classified as a high severity vulnerability due to improper validation of user-controlled input.
How do I fix CVE-2025-31138?
To fix CVE-2025-31138, update tarteaucitron.js to version 1.20.1 or higher.
What impact does CVE-2025-31138 have on affected systems?
CVE-2025-31138 could allow attackers to manipulate element dimensions, leading to potential security issues in web applications.
Which versions of tarteaucitron.js are affected by CVE-2025-31138?
CVE-2025-31138 affects all versions of tarteaucitron.js prior to version 1.20.1.
How can I ensure my application is safe from CVE-2025-31138?
To ensure safety from CVE-2025-31138, implement the latest version of tarteaucitron.js and validate user inputs thoroughly.