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CVE-2025-31475: tarteaucitron.js custom text feature lets attackers alter site behavior

CVE-2025-31475 · published 1 year ago

Summary

If you are using tarteaucitron.js version earlier than 1.20.1, the function that adds custom text does not check the input properly. Someone who can edit your site’s code or a plugin could trick the script into changing core JavaScript behavior, which may cause data errors, crashes or unexpected actions. Update tarteaucitron.js to version 1.20.1 or later to stop this risk.

What to do

Update amauri tarteaucitronjs to version 1.20.1.

Affected software

Ecosystem	Vendor	Product	Affected versions
npm	amauri	tarteaucitronjs	< 1.20.1 Fix: upgrade to 1.20.1
–	amauri	tarteaucitronjs	< 1.20.1 `cpe:2.3:a:amauri:tarteaucitronjs::::::node.js::*`

Original advisory text

tarteaucitron.js allows prototype pollution via custom text injection

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.

References

https://github.com/advisories/GHSA-4hwx-xcc5-2hfc
https://github.com/AmauriC/tarteaucitron.js/security/advisories/GHSA-4hwx-xcc5-2... Vendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2025-31475 Vendor Advisory
https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/31xxx/CVE-2025-31475... Vendor Advisory
https://github.com/AmauriC/tarteaucitron.js/commit/74c354c413ee3f82dff97a15a0a43... Patch

Fix within

Internet-facing 14 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit
Gives an attacker full control

Severity

5.5 Medium

Exploitation

<1% chance of attack within 30 days

Type

CWE-1321Prototype Pollution

Timeline

Published7 Apr 2025

Updated4 Nov 2026

First seen6 Mar 2026

Sources

GHSA-4hwx-xcc5-2hfc · GHSA

CVE-2025-31475 · NVD

CVE-2025-31475 · OSV

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