CVE-2026-107257 Drupal CVE debrief

Who should care

Drupal users who have the Actstream module installed should assess their exposure and verify their module versions. Defenders should prioritize verifying and updating Actstream module versions to prevent potential access bypass. Drupal administrators should review and restrict access to configuration routes for the Actstream module.

Why it matters

The Actstream module for Drupal has an access bypass vulnerability. Defenders should prioritize verifying and updating module versions and restricting access to configuration routes.

• Defenders need to verify and update Actstream module versions to prevent potential access bypass.
• Drupal administrators should review and restrict access to configuration routes for the Actstream module.

Technical summary

The Actstream module for Drupal aggregates user activity from external services into per-user activity stream entities. A configuration route does not sufficiently check that the user editing it is the account owner or a user administrator, leading to an access bypass vulnerability. This issue arises from insufficient checks on user editing permissions for configuration routes, potentially allowing unauthorized access to sensitive areas of the site. The vulnerability affects Drupal users who have the Actstream module installed.

Defensive priority

Defenders should prioritize verifying and updating Actstream module versions to prevent potential access bypass.

Recommended defensive actions

• Verify Actstream module version and update to 2.0.1 or later if using a version less than 2.0.1
• Verify Actstream module version and update to 2.1.1 or later if using a version between 2.1.0 and 2.1.1
• Review and restrict access to configuration routes for the Actstream module
• 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

Evidence from the OSV Dev source and Drupal advisory suggests an access bypass vulnerability exists in the Actstream module. However, specific details about exploitation are limited. The vulnerability is related to insufficient checks on user editing permissions for configuration routes. Defenders should verify and update Actstream module versions to prevent potential access bypass. The Actstream module aggregates user activity from external services into per-user activity stream entities.

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.