Drupal core Cross-site Scripting (XSS) vulnerability in ckeditor

Exploitation

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

CVSS

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

EPSS

• CVE-2020-13669: 0.74% estimated exploitation activity in the next 30 days; percentile 54.77 (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.

Cross-site Scripting (XSS) vulnerability in ckeditor of Drupal Core allows attacker to inject XSS. This issue affects: Drupal Core 8.8.x versions prior to 8.8.10.; 8.9.x versions prior to 8.9.6; 9.0.x versions prior to 9.0.6.

Published by the source

12 Feb 2022, 00:00 UTC

Last modified by the source

15 May 2024, 20:52 UTC

Source last checked

26 Oct 2026, 14:24 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-c533-c843-67h8

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# Patch Next advisory brief: CVE-2020-13669

Advisory: Drupal core Cross-site Scripting (XSS) vulnerability in ckeditor
IDs: CVE-2020-13669, GHSA-c533-c843-67h8
Record: https://patchnext.com/advisories/cve-2020-13669 (revision 1, source checked 26 Oct 2026, 14:24 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: drupal/core 9.0.6, 8.9.6, 8.8.10; drupal/drupal 9.0.6, 8.9.6, 8.8.10. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist drupal/core: affected >= 8.0.0, < 8.8.10; >= 8.9.0, < 8.9.6; >= 9.0.0, < 9.0.6; fixed in 9.0.6, 8.9.6, 8.8.10
- Packagist drupal/drupal: affected >= 8.0.0, < 8.8.10; >= 8.9.0, < 8.9.6; >= 9.0.0, < 9.0.6; fixed in 9.0.6, 8.9.6, 8.8.10

## Suggested inspection (read-only)
- Packagist drupal/core: check the installed version with your package manager.
- Packagist drupal/drupal: check the installed version with your package manager.

## 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 drupal/core, drupal/drupal.
- 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://github.com/advisories/GHSA-c533-c843-67h8 (GitHub-reviewed advisory GHSA-c533-c843-67h8 lists affected ranges: Packagist drupal/core >=8.0.0 =8.9.0 =9.0.0 =8.0.0 =8.9.0 =9.0.0 <9.0.6)

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