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CVE-2026-13635 Synology CVE debrief

CVE-2026-13635 is an improper encoding or escaping of output vulnerability in Synology DiskStation Manager (DSM). The CVE record was published on 2026-09-18T09:16:38.637Z and has not been modified since then. This vulnerability affects the Auth API in Synology DiskStation Manager (DSM) versions before 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4, and 7.4-90075. The vulnerability could allow remote attackers to obtain non-sensitive information. Further verification is required to determine the full scope of affected versions and potential impact.

Vendor
Synology
Product
DiskStation Manager (DSM)
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-18
Original CVE updated
2026-09-18
Advisory published
2026-09-18
Advisory updated
2026-09-18

Who should care

Defenders responsible for Synology DiskStation Manager (DSM) deployments should assess exposure and potential impact. This includes verifying the version of DSM in use and checking for updates. Defenders should also monitor for any suspicious activity related to the vulnerability. The vulnerability could allow remote attackers to obtain non-sensitive information, which may have implications for data confidentiality.

Why it matters

Defenders should prioritize verifying exposure and assessing potential impact on Synology DiskStation Manager (DSM) deployments. The vulnerability could allow remote attackers to obtain non-sensitive information. Further verification is required to determine the full scope of affected versions and potential impact.

  • Obtain non-sensitive information

Technical summary

The vulnerability is an improper encoding or escaping of output in the Auth API of Synology DiskStation Manager (DSM). This could allow remote attackers to obtain non-sensitive information. The affected versions are before 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4, and 7.4-90075. Defenders should prioritize verifying exposure and assessing potential impact on Synology DiskStation Manager (DSM) deployments.

Defensive priority

Defenders should prioritize verifying exposure and assessing potential impact on Synology DiskStation Manager (DSM) deployments.

Recommended defensive actions

  • Verify Synology DiskStation Manager (DSM) version and check for updates
  • Assess exposure and potential impact on DSM deployments
  • Monitor for any suspicious activity related to the vulnerability

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 versions and potential impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-13635 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-13635

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-13635 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-13635

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental 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.