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MEDIUM severity

Cross-site Scripting in Drupal CoreGHSA-m6q5-wv4x-fv6h

MEDIUMFix: drupal/core@3184fa4

GHSA-m6q5-wv4x-fv6h 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-2020-13668CVE-2020-13668
Published
Updated
Affected
6 pkgs
Patched
6 / 6
Exploits
None indexed
Exploitation data as of Oct 12, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.8%probability of exploitation in next 30 days
Lower Risk+0.11%
Lower risk than most CVEs55th percentile — riskier than 55% of all scored CVEsHighest risk
0.00%0.43%0.86%1.29%0.2%0.8%Apr 26Jul 26Oct 26

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

How urgent is this, really

GHSA-m6q5-wv4x-fv6h by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 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

Access Bypass vulnerability in Drupal Core allows for an attacker to leverage the way that HTML is rendered for affected forms in order to exploit the vulnerability. 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-m6q5-wv4x-fv6h 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

Access Bypass vulnerability in Drupal Core allows for an attacker to leverage the way that HTML is rendered for affected forms in order to exploit the vulnerability. 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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Cross-site Scripting in Drupal Core (Medium 6.1)