Synology DSM <7.4.1 Auth API XSS Escaping Issue
CVE-2026-13635 Published on September 18, 2026
An improper encoding or escaping of output vulnerability in Auth API 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 obtain non-sensitive information.
Vulnerability Analysis
CVE-2026-13635 can be exploited 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 have a small impact on confidentiality, a small impact on integrity and availability.
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-2026-13635 has been classified to as an Output Sanitization vulnerability or weakness.
Products Associated with CVE-2026-13635
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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.