CVE-2026-13684

Improper Encoding in SCGI Allows Remote File Read/Write and DoS in Synology DSM

Published Sep 18, 2026 CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Synology
Synology diskstation Manager
Vendors & Products Synology
Synology diskstation Manager
Type Values Removed Values Added
Title Improper Encoding in SCGI Allows Remote File Read/Write and DoS in Synology DSM
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Weaknesses CWE-116
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
synology
Published
Updated
Sep 18, 2026, 7:14 PM
Reserved
Jun 29, 2026, 10:42 AM
Status
Awaiting Analysis
Published
Sep 18, 2026, 9:16 AM
Modified
Sep 18, 2026, 8:17 PM