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HIGH severity

CVE-2020-13677 — core

HIGHFix: drupal/core@7a9bef4

CVE-2020-13677 is a high-severity (CVSS 7.5) CWE-284 vulnerability in drupal/core. A fix is available for drupal/core — see the affected versions and patch details below.

Drupal core access bypass vulnerability

Also known asBIT-drupal-2020-13677DRUPAL-CORE-2021-010GHSA-3xr3-phjp-g6p2
Published
Updated
Affected
3 pkgs
Patched
3 / 3
Exploits
None indexed
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs68th percentile — riskier than 68% of all scored CVEsHighest risk
0.00%0.57%1.14%1.72%0.2%1.2%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2020-13677 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

3 pkgs affected
🐘drupal/core🐘drupal/core🐘drupal/core

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

Under some circumstances, the Drupal core JSON:API module does not properly restrict access to certain content, which may result in unintended access bypass. Sites that do not have the JSON:API module enabled are not affected.

Affected Packages

3 total 3 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistdrupal/core≥ 8.0.0&&< 8.9.198.9.19composer require drupal/core:^8.9.19
🐘Packagistdrupal/core≥ 9.1.0&&< 9.1.139.1.13composer require drupal/core:^9.1.13
🐘Packagistdrupal/core≥ 9.2.0&&< 9.2.69.2.6composer require drupal/core:^9.2.6

Affected Products

1 product · 3 configurations
Application
drupaldrupal
≥ 9.2.0 && < 9.2.6
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 8.9.19 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-13677 is resolved across your whole dependency graph.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

Under some circumstances, the Drupal core JSON:API module does not properly restrict access to certain content, which may result in unintended access bypass. Sites that do not have the JSON:API module enabled are not affected.
O3 Security · Impact-Aware SCA

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CVE-2020-13677: core — Fixed in 8.9.19