SCGI Improper Escaping in Synology DSM <7.4 (pre7.4.0)
CVE-2026-13684 Published on September 18, 2026
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.
Vulnerability Analysis
CVE-2026-13684 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Weakness Type
What is an Output Sanitization Vulnerability?
The software prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.
CVE-2026-13684 has been classified to as an Output Sanitization vulnerability or weakness.
Products Associated with CVE-2026-13684
Want to know whenever a new CVE is published for Synology Diskstation Manager? stack.watch will email you.
Affected Versions
Synology DiskStation Manager (DSM):- Version 7.4 and below 7.4-90075 is affected.
- Version 7.3.2 and below 7.3.2-86009-4 is affected.
- Version 7.2.2 and below 7.2.2-72806-9 is affected.
- Version 7.2.1 and below 7.2.1-69057-12 is affected.
- Before 7.2.1 is unknown.