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

What is CVE-2026-6366?

CVE-2026-6366 is a medium-severity unsafe deserialization vulnerability in Drupal Drupal, published on 19 May 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official 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.

Weakness: CWE-915

Which versions are affected by CVE-2026-6366?

10 open source packages ship an affected version, including drupal/core and drupal. It affects 1 product.

Products include Drupal Drupal.

How do I fix CVE-2026-6366?

Upgrade drupal/core to a fixed version for your release line: 10.6.7, 11.2.11, 11.3.7 or 10.5.9.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2026-6366 being exploited?

There is no known exploitation of CVE-2026-6366 in the wild and no public exploit code.

Other vulnerabilities in Drupal Drupal

• CVE-2026-9082 Drupal Core SQL Injection Exploited Critical 9.8
• CVE-2020-13671 Drupal core Un-restricted Upload of File Exploited High 8.8
• CVE-2019-6340 Drupal Core Remote Code Execution Exploited High 8.1
• CVE-2009-3352 Other in n/a Critical 10.0
• CVE-2024-55636 Drupal core - Less critical - Gadget chain - SA-CORE-2024-006 Critical 9.8

All Drupal Drupal vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-drupal-2026-6366, DRUPAL-CORE-2026-002, GHSA-xmjc-63pr-2mpg.