@udecode/plate-link does not sanitize URLs to prevent use of the javascript: scheme

Exploitation

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

CVSS

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

EPSS

• CVE-2023-34245: 0.45% estimated exploitation activity in the next 30 days; percentile 38.75 (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.

Impact Affected versions of the link plugin and link UI component do not sanitize URLs to prevent use of the javascript: scheme. As a result, links with JavaScript URLs can be inserted into the Plate editor through various means, including opening or pasting malicious content. Patches @udecode/plate-link 20.0.0 resolves this issue by introducing an allowedSchemes option to the link plugin, defaulting to ['http', 'https', 'mailto', 'tel']. URLs using a scheme that isn't in this list will not be rendered to the DOM. Workarounds If you are unable to update @udecode/plate-link to version 20.0.0, we recommend overriding the LinkElement and PlateFloatingLink components with implementations that explicitly check the URL scheme before rendering any anchor elements.

Published by the source

9 Jun 2023, 22:41 UTC

Last modified by the source

10 Sep 2026, 03:50 UTC

Source last checked

26 Oct 2026, 12:29 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-4882-hxpr-hrvm

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-4882-hxpr-hrvm

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# Patch Next advisory brief: CVE-2023-34245

Advisory: @udecode/plate-link does not sanitize URLs to prevent use of the `javascript:` scheme
IDs: CVE-2023-34245, GHSA-4882-hxpr-hrvm
Record: https://patchnext.com/advisories/cve-2023-34245 (revision 2, source checked 26 Oct 2026, 12:29 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @udecode/plate-link 20.0.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @udecode/plate-link: affected < 20.0.0; fixed in 20.0.0

## Suggested inspection (read-only)
- `npm ls @udecode/plate-link --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 @udecode/plate-link.
- 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-4882-hxpr-hrvm (OSV record GHSA-4882-hxpr-hrvm lists affected ranges: npm @udecode/plate-link >=0 <20.0.0 (fixed))
- Verified: https://github.com/advisories/GHSA-4882-hxpr-hrvm (GitHub-reviewed advisory GHSA-4882-hxpr-hrvm lists affected ranges: npm @udecode/plate-link >=0 <20.0.0)

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