What is CVE-2026-13684?

CVE-2026-13684 is a critical-severity vulnerability in Synology Diskstation Manager (Dsm), classified under Improper Encoding or Escaping of Output. CVSS score: 9.8/10. Published 2026-09-18.

How severe is CVE-2026-13684?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Synology Diskstation Manager (Dsm)

CVE-2026-13684

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.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Synology Diskstation Manager (Dsm)

Weakness classification (CWE)

CWE-116 — Improper Encoding or Escaping of Output

References

security@synology.com

Frequently asked questions

What is CVE-2026-13684?: CVE-2026-13684 is a critical-severity vulnerability in Synology Diskstation Manager (Dsm), classified under Improper Encoding or Escaping of Output. CVSS score: 9.8/10. Published 2026-09-18.
How severe is CVE-2026-13684?: Critical severity. CVSS v3 base score is 9.8 out of 10.