CVE-2025-31475: tarteaucitron.js allows prototype pollution via custom text injection
A vulnerability was identified in tarteaucitron.js, where the addOrUpdate function, used for applying custom texts, did not properly validate input. This allowed an attacker with direct access to the site's source code or a CMS plugin to manipulate JavaScript object prototypes, leading to potential security risks such as data corruption or unintended code execution.
Impact An attacker with high privileges could exploit this vulnerability to: - Modify object prototypes, affecting core JavaScript behavior, - Cause application crashes or unexpected behavior, - Potentially introduce further security vulnerabilities depending on the application's architecture.
Fix https://github.com/AmauriC/tarteaucitron.js/commit/74c354c413ee3f82dff97a15a0a43942887c2b5b The issue was resolved by ensuring that user-controlled inputs cannot modify JavaScript object prototypes.
Other sources
tarteaucitron.js is a compliant and accessible cookie banner. A vulnerability was identified in tarteaucitron.js prior to 1.20.1, where the addOrUpdate function, used for applying custom texts, did not properly validate input. This allowed an attacker with direct access to the site's source code or a CMS plugin to manipulate JavaScript object prototypes, leading to potential security risks such as data corruption or unintended code execution. An attacker with high privileges could exploit this vulnerability to modify object prototypes, affecting core JavaScript behavior, cause application crashes or unexpected behavior, or potentially introduce further security vulnerabilities depending on the application's architecture. This vulnerability is fixed in 1.20.1.
— MITRE
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2025-31475?
CVE-2025-31475 has been classified as a medium severity vulnerability due to improper input validation.
How do I fix CVE-2025-31475?
To fix CVE-2025-31475, upgrade tarteaucitron.js to version 1.20.1 or later.
Who is affected by CVE-2025-31475?
CVE-2025-31475 affects all versions of tarteaucitron.js prior to 1.20.1.
What functionality does the addOrUpdate function in CVE-2025-31475 provide?
The addOrUpdate function in tarteaucitron.js is used for applying custom texts to the cookie banner.
What types of attacks could exploit CVE-2025-31475?
CVE-2025-31475 could allow attackers with direct access to a site's scripts to execute unvalidated input, leading to potential security breaches.