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MEDIUM severity

Drupal core Cross-site Scripting (XSS) vulnerability in ckeditorGHSA-c533-c843-67h8

MEDIUM

GHSA-c533-c843-67h8 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in drupal/core. A fix is available for drupal/core — see the affected versions and patch details below.

Also known asBIT-drupal-2020-13669CVE-2020-13669DRUPAL-CORE-2020-010
Published
Updated
Affected
6 pkgs
Patched
6 / 6
Exploits
None indexed
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs53th percentile — riskier than 53% of all scored CVEsHighest risk
0.00%0.41%0.83%1.24%0.2%0.7%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-c533-c843-67h8 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,386 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

6 pkgs affected
🐘drupal/core🐘drupal/core🐘drupal/core🐘drupal/drupal🐘drupal/drupal🐘drupal/drupal

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

6 total 6 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistdrupal/core≥ 8.0.0&&< 8.8.108.8.10composer require drupal/core:^8.8.10
🐘Packagistdrupal/core≥ 8.9.0&&< 8.9.68.9.6composer require drupal/core:^8.9.6
🐘Packagistdrupal/core≥ 9.0.0&&< 9.0.69.0.6composer require drupal/core:^9.0.6
🐘Packagistdrupal/drupal≥ 8.0.0&&< 8.8.108.8.10composer require drupal/drupal:^8.8.10
🐘Packagistdrupal/drupal≥ 8.9.0&&< 8.9.68.9.6composer require drupal/drupal:^8.9.6
🐘Packagistdrupal/drupal≥ 9.0.0&&< 9.0.69.0.6composer require drupal/drupal:^9.0.6

Affected Products

1 product · 3 configurations
Application
drupaldrupal
≥ 9.0.0 && < 9.0.6
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for drupal/core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update drupal/core to 8.8.10 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-c533-c843-67h8 is resolved across your whole dependency graph.

  3. 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

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.
O3 Security · Impact-Aware SCA

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