tarteaucitron.js allows UI manipulation via unrestricted CSS injection

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

5.5 · CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N

EPSS

• CVE-2025-31138: 0.27% estimated exploitation activity in the next 30 days; percentile 19.38 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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.

Published by the source

7 Apr 2025, 16:38 UTC

Last modified by the source

7 Apr 2025, 18:12 UTC

Source last checked

26 Oct 2026, 12:36 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-7524-3396-fqv3

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-7524-3396-fqv3

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# Patch Next advisory brief: CVE-2025-31138

Advisory: tarteaucitron.js allows UI manipulation via unrestricted CSS injection
IDs: CVE-2025-31138, GHSA-7524-3396-fqv3
Record: https://patchnext.com/advisories/cve-2025-31138 (revision 2, source checked 26 Oct 2026, 12:36 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: tarteaucitronjs 1.20.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm tarteaucitronjs: affected < 1.20.1; fixed in 1.20.1

## Suggested inspection (read-only)
- `npm ls tarteaucitronjs --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on tarteaucitronjs.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-7524-3396-fqv3 (OSV record GHSA-7524-3396-fqv3 lists affected ranges: npm tarteaucitronjs >=0 <1.20.1 (fixed))
- Verified: https://github.com/advisories/GHSA-7524-3396-fqv3 (GitHub-reviewed advisory GHSA-7524-3396-fqv3 lists affected ranges: npm tarteaucitronjs >=0 <1.20.1)

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