Drupal up to 11.3.11 Core injection

Summaryinfo

A vulnerability marked as critical has been reported in Drupal up to 11.3.11. The impacted element is an unknown function of the component Core. Performing a manipulation results in injection. This vulnerability was named CVE-2026-55803. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability classified as critical has been found in Drupal up to 11.3.11. This affects an unknown code of the component Core. The manipulation with an unknown input leads to a injection vulnerability. CWE is classifying the issue as CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.*.

It is possible to read the advisory at drupal.org. This vulnerability is uniquely identified as CVE-2026-55803 since 06/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1055 according to MITRE ATT&CK.

Upgrading to version 10.5.12, 10.6.11, 11.0.x, 11.1.x, 11.2.14 or 11.3.12 eliminates this vulnerability.

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Productinfo

Type

• Content Management System

Name

• Drupal

Version

• 10.5.0
• 10.5.1
• 10.5.2
• 10.5.3
• 10.5.4
• 10.5.5
• 10.5.6
• 10.5.7
• 10.5.8
• 10.5.9
• 10.5.10
• 10.5.11
• 10.6.0
• 10.6.1
• 10.6.2
• 10.6.3
• 10.6.4
• 10.6.5
• 10.6.6
• 10.6.7
• 10.6.8
• 10.6.9
• 10.6.10
• 11.0
• 11.1
• 11.2.0
• 11.2.1
• 11.2.2
• 11.2.3
• 11.2.4
• 11.2.5
• 11.2.6
• 11.2.7
• 11.2.8
• 11.2.9
• 11.2.10
• 11.2.11
• 11.2.12
• 11.2.13
• 11.3.0
• 11.3.1
• 11.3.2
• 11.3.3
• 11.3.4
• 11.3.5
• 11.3.6
• 11.3.7
• 11.3.8
• 11.3.9
• 11.3.10
• 11.3.11

License

• open-source

Website

• Product: https://www.drupal.org/

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