CVE-2026-118566 Drupal CVE debrief

Who should care

Drupal site administrators and developers who use the Content Synchronizer module should assess their exposure and take necessary actions to mitigate the vulnerability. This includes verifying the module version, reviewing and sanitizing user-input data, and implementing additional security measures to detect and prevent XSS attacks. Security teams responsible for vulnerability management and incident response should also be aware of this vulnerability and

Why it matters

The Content Synchronizer module for Drupal has a DOM-based XSS vulnerability. Defenders should prioritize verifying exposure, applying patches, and implementing additional security measures to prevent XSS attacks.

• Defenders must verify exposure and apply patches for the Content Synchronizer module.
• Site administrators should review and sanitize user-input data passed to client-side code.
• Additional security measures are required to detect and prevent XSS attacks.

Technical summary

The Content Synchronizer module for Drupal is vulnerable to a DOM-based cross-site scripting (XSS) attack. The module allows content to be exported and imported between Drupal sites via uploaded archive files. However, it does not sufficiently sanitize input passed to its client-side code, leading to the XSS vulnerability. This vulnerability can be exploited by injecting malicious scripts into the imported content, potentially allowing attackers to manipulate site content or steal sensitive information. Defenders should prioritize verifying exposure and applying patches for the Content Synchronizer module, particularly for versions less than 4.1.1.

Defensive priority

Defenders should prioritize verifying exposure and applying patches for the Content Synchronizer module, particularly for versions less than 4.1.1.

Recommended defensive actions

• Verify the version of the Content Synchronizer module and update to 4.1.1 or later if necessary.
• Review and sanitize any user-input data passed to the client-side code.
• Implement additional security measures to detect and prevent XSS attacks.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The vulnerability is confirmed in the Content Synchronizer module versions less than 4.1.1. Official sources include the CVE Program, NVD, and Drupal advisory. Evidence is limited to public CVE and NVD records, which confirm the vulnerability but do not provide detailed exploit information. Defenders should verify exposure by checking their module versions and review official advisories for mitigation guidance.

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.