DiskStation Manager (DSM): Missing Critical Step in Authentication
CVE-2026-74857 is a high-severity missing critical step in authentication vulnerability in DiskStation Manager (DSM) from Synology, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. The record lists versions 7.4.1-90080-1, 7.3.2-86009-5 as the first without the flaw, so updating DiskStation Manager (DSM) to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.89% chance of exploitation within 30 days, higher than 60% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update DiskStation Manager (DSM) to 7.4.1-90080-1 or 7.3.2-86009-5, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Synology | DiskStation Manager (DSM) | 7.4.1 up to, but not including, 7.4.1-90080-1; 7.3.2 up to, but not including, 7.3.2-86009-5 | 7.4.1-90080-1, 7.3.2-86009-5 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by CNA (synology.com).
Official description
A missing critical step in authentication vulnerability in the Auth API in Synology DiskStation Manager (DSM) before 7.3.2-86009-5 and 7.4.1-90080-1 allows remote authenticated users to read or write arbitrary files and conduct denial-of-service attacks.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Missing Critical Step in Authentication
The product implements an authentication technique, but it skips a step that weakens the technique.
More Missing Critical Step in Authentication vulnerabilities (CWE-304)
Timeline
- CVE record published.
References
Other references
Other vulnerabilities in DiskStation Manager (DSM)
- 8.6 High severity
- 8.1 High severity
- 9.8 Critical severity
- 7.2 High severity
- 8.1 High severity
- 8.8 High severity
Recent Missing Critical Step in Authentication vulnerabilities
- 9.4 Critical severity
- 7.7 High severity
- 8.1 High severity
- 9.8 Critical severity
- 8.8 High severity
- 8.7 High severity
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