CVE-2026-4036 Synology CVE debrief

Who should care

Defenders responsible for Synology DSM systems, especially those with remote access or shared file access, should assess potential exposure and impact. This includes IT administrators, security teams, and operators who manage Synology DSM systems. They should prioritize verifying exposure and assessing potential impact, and apply vendor patches or updates according to Synology's guidance.

Why it matters

CVE-2026-4036 is a SQL injection vulnerability in Synology DiskStation Manager (DSM) that allows remote authenticated users to obtain arbitrary sharing files. Defenders should prioritize verifying exposure and assessing potential impact, especially for systems with remote access or shared file access.

• Potential unauthorized access to shared files
• Need for verification of Synology DSM versions and configurations
• Possible impact on systems with remote access or shared file access

Technical summary

The vulnerability is caused by improper neutralization of special elements used in an SQL command in the Sharing API of Synology DSM. This allows remote authenticated users to obtain arbitrary sharing files. The affected products are Synology DSM versions before 7.2.1-69057-10, 7.2.2-72806-7, and 7.3.2-86009-2. Defenders should prioritize verifying exposure and assessing potential impact, especially for systems with remote access or shared file access. Synology has provided security advisories that may contain additional details.

Defensive priority

Defenders should prioritize verifying exposure and assessing potential impact, especially for systems with remote access or shared file access.

Recommended defensive actions

• Verify exposure by checking Synology DSM versions and configurations
• Assess potential impact on systems with remote access or shared file access
• Monitor for suspicious activity related to sharing files
• Apply vendor patches or updates according to Synology's guidance
• 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

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. Further verification is required to determine the full scope of affected systems and potential impact. Synology has provided security advisories that may contain additional details. Defenders should review these advisories and verify the configurations of their Synology DSM systems.

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.