CVE-2025-31476 is a medium-severity (CVSS 4.8) Cross-site Scripting (XSS) vulnerability in tarteaucitronjs. A fix is available for tarteaucitronjs — see the affected versions and patch details below.
tarteaucitron.js allows url scheme injection via unfiltered inputs
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2025-31476.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.
tarteaucitronjsnpmDescription
A vulnerability was identified in tarteaucitron.js, allowing a user with high privileges (access to the site's source code or a CMS plugin) to enter a URL containing an insecure scheme such as javascript:alert(). Before the fix, URL validation was insufficient, which could allow arbitrary JavaScript execution if a user clicked on a malicious link.
Impact
An attacker with high privileges could insert a link exploiting an insecure URL scheme, leading to:
- Execution of arbitrary JavaScript code
- Theft of sensitive data through phishing attacks
- Modification of the user interface behavior
Fix https://github.com/AmauriC/tarteaucitron.js/commit/2fa1e01023bce2e4b813200600bb1619d56ceb02
The issue was resolved by enforcing strict URL validation, ensuring that they start with http:// or https:// before being used.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | tarteaucitronjs | all versions | 1.20.1npm install tarteaucitronjs@1.20.1 |
Affected Products
tarteaucitronjsamauritacjstacjs_projectDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for tarteaucitronjs, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update tarteaucitronjs to 1.20.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-31476 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.
Frequently Asked Questions
Is CVE-2025-31476 in your dependencies?
Find it across npm, including transitive dependencies.