What is CVE-2026-6366?

CVE-2026-6366 is a medium-severity vulnerability in Drupal, classified under Improperly Controlled Modification of Dynamically-Determined Object Attributes. CVSS score: 6.6/10. Published 2026-05-19.

How severe is CVE-2026-6366?

Medium severity. CVSS v3 base score is 6.6 out of 10.

Vulnerability in Drupal

CVE-2026-6366

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 b…

Vulnerability class: Mass Assignment

EPSS: 0.001 (20.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.

Affected products

Drupal
Drupal Core — versions 8.0.0, 10.6.0, 11.0.0

Weakness classification (CWE)

CWE-915 — Improperly Controlled Modification of Dynamically-Determined Object Attributes

References

mlhess@drupal.org (Vendor Advisory)

Frequently asked questions

What is CVE-2026-6366?: CVE-2026-6366 is a medium-severity vulnerability in Drupal, classified under Improperly Controlled Modification of Dynamically-Determined Object Attributes. CVSS score: 6.6/10. Published 2026-05-19.
How severe is CVE-2026-6366?: Medium severity. CVSS v3 base score is 6.6 out of 10.