CVE-2026-13684 Synology DiskStation Manager - Improper Output Encoding

Synology DiskStation Manager (DSM) < 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4, and 7.4-90075 contains an improper encoding or escaping of output vulnerability in SCGI, letting remote attackers read or write arbitrary files and cause denial-of-service, exploit requires network access.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.60% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Improper Output Encoding
Impact
File System Read, File System Write, Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
18 September 2026
Updated
15 October 2026
Weakness
CWE-116

Vendor fix

Update to versions 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4, 7.4-90075 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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