Vulnerability · Published Jul 10, 2026 · Assigned by drupal
CVE-2026-55803Drupal core - Critical - PHP object injection - SA-CORE-2026-005
Medium 5.9
In plain English
A medium-severity security flaw in Drupal core from Drupal. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Improperly Controlled Modification of Dynamically-Determined Object Attributes vulnerability in Drupal Drupal core allows Object Injection. This issue affects Drupal core versions: from 0.0.0 to 10.5.12, from 10.6.0 to 10.6.11, from 11.2.0 to 11.2.14, from 11.3.0 to 11.3.12, from 0.0.0 to 11.0.*, from 0.0.0 to 11.1.*.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | drupal/core | 10.5.12, 10.6.11, 11.1.0, 11.2.0, 11.2.14, 11.3.12 | DRUPAL-CORE-2026-005 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Drupal | Drupal core | 0.0.0 – before 10.5.1210.6.0 – before 10.6.1111.2.0 – before 11.2.1411.3.0 – before 11.3.120.0.0 – before 11.0.*0.0.0 – before 11.1.* |
Weakness: CWE-915 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N