CVE-2026-55803 Drupal CVE debrief

Who should care

Drupal users and administrators should review and apply patches for affected versions. This vulnerability has a high impact on Drupal deployments, and users should verify their deployments and assign an owner for follow-up. Review compensating controls for exposed systems while remediation is scheduled and verified.

Technical summary

The CVE-2026-55803 vulnerability is classified as CWE-915, Improperly Controlled Modification of Dynamically-Determined Object Attributes in Drupal core, allowing 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.*, and from 0.0.0 to 11.1.*. The vulnerability has a high impact on Drupal users and administrators. To address this vulnerability, users should review and apply patches for affected versions. Verification of affected versions and patch application is necessary. Review compensating controls for exposed systems while remediation is scheduled and verified. This vulnerability allows attackers to inject objects, potentially leading to security breaches. It is essential for Drupal users and administrators to understand the scope of the vulnerability and apply patches for affected versions.

Defensive priority

High priority for Drupal users and administrators to apply patches and review compensating controls for exposed systems.

Recommended defensive actions

• Review and apply patches for affected Drupal versions
• Inventory checks for affected versions
• Monitoring for potential exploitation attempts
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The evidence for this CVE is limited. Verification of affected versions and patch application is necessary. Drupal users and administrators should review the official CVE record and NVD details to understand the scope of the vulnerability. The CVE record was published on 2026-07-10T22:16:43.250Z and has not been modified since then. Affected versions include 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.*, and from 0.0.0 to 11.1.*.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.