High-severity remote arbitrary file read/write + DoS in Synology DSM, a widely deployed NAS platform; can expose or alter enterprise data and disrupt services — fixed versions released.
CVE-2026-13684
Critical remote arbitrary file read/write and DoS in Synology DSM via SCGI
Is CVE-2026-13684 being exploited?
Not confirmed. CVE-2026-13684 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-13684?
CVE-2026-13684 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-13684?
Yes. A fix has been recorded for CVE-2026-13684. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-13684 affect?
CVE-2026-13684 affects Synology DiskStation Manager (DSM) prior to 7.2.1-69057-12, DSM prior to 7.2.2-72806-9, DSM prior to 7.3.2-86009-4, DSM prior to 7.4-90075. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-13684?
Apply Synology DSM updates to the fixed versions immediately; validate integrity and rotate credentials.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote attackers can read/write arbitrary files and cause DoS via SCGI, enabling data theft, tampering, and potential follow-on compromise.
Immediate action required
- affected>= 7.4 and < 7.4-90075
- affected>= 7.3.2 and < 7.3.2-86009-4
- affected>= 7.2.2 and < 7.2.2-72806-9
- affected>= 7.2.1 and < 7.2.1-69057-12
- affected< 7.2.1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.