Vulnerability report

Trusted Third Party Report High Confidence Not in CISA KEV

CVE-2026-13684

DiskStation Manager (DSM)

Synology / DiskStation Manager (DSM · affected before 7.4-90075

Watch CVE-2026-13684 Browse KEV feed
Severity
CVSS 9.8 · Critical
Confidence
High
Exploit status
Trusted Third Party Report
EPSS
0.6%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-13684 is an unauthenticated vulnerability affecting Synology DiskStation Manager (DSM.

Have exploitation attempts been observed?

Yes. Exploitation attempts have been reported for this vulnerability. Previdian lists it as a known exploited vulnerability. Also reported by third-party sources. Confidence is high.

Who is affected?

Synology / DiskStation Manager (DSM, including affected before 7.4-90075, affected before 7.3.2-86009-4, and affected before 7.2.2-72806-9.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

DiskStation Manager (DSM)

An improper encoding or escaping of output vulnerability in SCGI in Synology DiskStation Manager (DSM) before 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4 and 7.4-90075 allows remote attackers to read or write arbitrary files and conduct denial-of-service attacks.

Synology Affected
DiskStation Manager (DSM)
Before 7.4-90075 Before 7.3.2-86009-4 Before 7.2.2-72806-9 Before 7.2.1-69057-12
Published
18 Sep 2026
Exploitation Attempts Reported
09 Nov 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

CVE References

  • CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-13684
  • Synology-SA-26:13 DSM synology.com · CVE Record https://www.synology.com/en-global/security/advisory/Synology_SA_26_13

Exploitation evidence

Evidence of exploitation attempts

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploitation Attempts Observed in the Wild

360.cn

Recorded 09 Nov 2026

A trusted third party reported exploitation attempts.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
360.cn First 2026-11-09 22:41 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

9.8 Critical

Potential damage if exploited. Separate from whether attackers are using it.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.6%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Improper Encoding or Escaping of Output CWE-116

Recent mention · CERT Polska

Podatności w systemie Synology DSM wykorzystywane w atakach ransomware

Zespół CERT Polska informuje o podatnościach w systemie Synology DiskStation Manager (DSM), które są wykorzystywane w atakach ransomware na urządzenia NAS Synology.Synology ostrzega przed atakami wymierzonymi w urządzenia działające pod kontrolą nieaktualnych wersji DSM....

Read full advisory

All Mentions

Recent mention · CERT Polska

Podatności w systemie Synology DSM wykorzystywane w atakach ransomware

CERT Polska · 03 Nov 2026

Zespół CERT Polska informuje o podatnościach w systemie Synology DiskStation Manager (DSM), które są wykorzystywane w atakach ransomware na urządzenia NAS Synology.Synology ostrzega przed atakami wymierzonymi w urządzenia działające pod kontrolą nieaktualnych wersji DSM. Według komunikatu producenta atakujący wykorzystują podatność CVE-2024-10441 (naprawioną w grudniu 2024 roku), która wynika z niewłaściwego kodowania w wybranych wtyczkach systemowych i umożliwia nieuwierzytelnionemu atakującemu zdalne wykonanie kodu. Celem ataków jest zaszyfrowanie danych oraz wymuszenie okupu za ich...

Recent mention · The Hacker News

Synology NAS Devices Targeted in Ransomware Attacks Exploiting Patched DSM Flaw

The Hacker News · 03 Nov 2026

Ravie LakshmananNov 03, 2026Ransomware / Cyber Attack Synology is urging customers to update the DiskStation Manager (DSM) software powering its Network Attached Storage (NAS) devices following ransomware attacks. The Taiwanese vendor said it observed threat actors exploiting a vulnerability patched in December 2024 to target devices running outdated versions of DSM. "These attacks aim to encrypt data and extort ransom," it said in a statement released last week. While Synology did not disclose the exact security flaw that's being exploited in these attacks, the company linked to a...

Timeline

From disclosure to observed exploitation attempts

  1. 22:41 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party report of exploitation attempts

  2. 08:19 UTC

    CVE published

    Vulnerability disclosed publicly

  3. 10:42 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-13684

Sample API response 
{
  "cve_id": "CVE-2026-13684",
  "confidence": "High",
  "cvss_score": 9.8,
  "cvss_estimated": false,
  "epss_score": 0.00599,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}