CVE-2026-107255 Drupal CVE debrief

Who should care

Site administrators and security teams responsible for Drupal installations, especially those using the restrict_route_by_ip module or having dynamic routes, should assess their exposure and take necessary actions to mitigate the vulnerability.

Why it matters

Defenders should care about CVE-2026-107255 because it involves an access bypass vulnerability in the restrict_route_by_ip module for Drupal. This vulnerability could allow unauthorized access to dynamic routes if not properly restricted. Site administrators and security teams should verify their use of the module, assess their exposure, and update to a fixed version to prevent potential exploitation. The impact of this vulnerability depends on how the site uses the module and whether it has dynamic routes.

• Verification of module usage and configuration is necessary to determine potential exposure.
• Updating the module to a fixed version is crucial to prevent potential access bypass.
• Monitoring access logs can help detect any suspicious activity related to this vulnerability.
• Understanding the site's use of dynamic routes is essential to assess the vulnerability's impact.

Technical summary

The DRUPAL-CONTRIB-2026-216 module for Drupal does not reliably restrict access to a subset of dynamic routes, leading to an access bypass vulnerability. This issue arises because the module's IP address restriction does not function correctly for all route types. The vulnerability's impact depends on the site's configuration and usage of dynamic routes. Site administrators and security teams should verify their use of the module, assess their exposure, and update to a fixed version to prevent potential exploitation.

Defensive priority

Defenders should prioritize verifying the use of the restrict_route_by_ip module, especially in environments with dynamic routes, and ensure that the module is updated to a fixed version.

Recommended defensive actions

• Verify the use of the restrict_route_by_ip module in your Drupal environment.
• Check if your site has dynamic routes that could be affected by this vulnerability.
• Update the module to version 1.3.1 or later, or 2.0.1 or later, depending on the version being used.
• Monitor your site's access logs for any suspicious activity that could indicate exploitation of this vulnerability.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The vulnerability was reported in the DRUPAL-CONTRIB-2026-216 advisory, which details the module's functionality and the nature of the access bypass vulnerability. The advisory is based on information from the Drupal security team.

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.