CVE-2026-13635 Synology CVE debrief

Who should care

Defenders responsible for Synology DSM deployments should assess exposure and prioritize verification and potential updates. This includes reviewing current DSM versions, identifying potentially affected systems, and planning for updates or mitigations as necessary. Security teams should also monitor for potential information disclosure and review compensating controls for exposed systems.

Why it matters

CVE-2026-13635 is a medium-severity vulnerability in Synology DSM that allows remote attackers to obtain non-sensitive information. Defenders should prioritize verifying exposure, assessing the need for updates, and monitoring for potential information disclosure.

• Potential information disclosure
• Need for version verification and updates
• Monitoring for anomalous activity

Technical summary

CVE-2026-13635 is an improper encoding or escaping of output vulnerability in the Auth API of Synology DiskStation Manager (DSM). The vulnerability allows remote attackers to obtain non-sensitive information. Affected versions include DSM 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4, and 7.4-90075.

Defensive priority

Defenders should prioritize verifying exposure in Synology DSM deployments and assessing the need for updates.

Recommended defensive actions

• Verify Synology DSM version and check for updates
• Assess exposure in current deployments
• Monitor for potential information disclosure

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. Further verification is needed to determine the full scope of affected versions and potential impact.

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.