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PatchSiren cyber security CVE debrief

CVE-2026-40537 Synology CVE debrief

A server-side request forgery (SSRF) vulnerability exists in PersonMail API of Synology DiskStation Manager (DSM) versions before 7.2.1-69057-10, 7.2.2-72806-7, and 7.3.2-86009-2. Remote authenticated users can exploit this to obtain non-sensitive information. This vulnerability has a medium severity and defenders should assess exposure, verify affected versions, and prioritize updates. IT administrators and security teams responsible for Synology DSM systems, particularly those with remote access or authentication configurations, should be aware of this issue.

Vendor
Synology
Product
DiskStation Manager (DSM)
CVSS
MEDIUM 4.3
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

IT administrators and security teams responsible for Synology DSM systems, particularly those with remote access or authentication configurations.

Why it matters

CVE-2026-40537 is a medium-severity SSRF vulnerability in Synology DSM that allows remote authenticated users to obtain non-sensitive information. Defenders should assess exposure, verify affected versions, and prioritize updates.

  • Verify authentication and access controls for PersonMail API
  • Assess exposure of sensitive information
  • Prioritize updates for affected DSM versions
  • Monitor for potential exploitation attempts

Technical summary

The PersonMail API in Synology DSM versions before 7.2.1-69057-10, 7.2.2-72806-7, and 7.3.2-86009-2 is vulnerable to SSRF, allowing remote authenticated users to obtain non-sensitive information. This vulnerability has a medium severity and defenders should assess exposure and prioritize verification of affected DSM versions, focusing on authentication and access controls.

Defensive priority

Assess exposure and prioritize verification of affected DSM versions, focusing on authentication and access controls.

Recommended defensive actions

  • Verify DSM version and apply updates if necessary
  • Review authentication and access controls for PersonMail API
  • Monitor for potential exploitation attempts

Evidence notes

The CVE record and NVD entry provide details on the SSRF vulnerability in Synology DSM. Vendor advisory Synology_SA_26_06 is also available. The vulnerability allows remote authenticated users to obtain non-sensitive information. Defenders should verify affected DSM versions, review authentication and access controls for PersonMail API, and monitor for potential exploitation attempts.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-40537 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-40537

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

  • CVE-2026-40537 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-40537

    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.