CVE
An improper limitation of a pathname to a restricted directory vulnerability in the Sharing API in Synology DiskStation Manager (DSM)…
- Exploited
- No known exploitation
- Fix
- Fixed in 7.4.1-90080-1, 7.3.2-86009-5
- Who is exposed
- Specific setups only
Do first: Check whether your setup matches what the bug needs. Affected product is Synology DiskStation Manager (DSM) before 7.3.2-86009-5 and before 7.4.1-90080-1, in the Sharing API.
- Published
- Last modified
- Whether it needs action now or is a reference record, by fixed rules, with why. Last checked is when cve.now last re-read it.What do these mean? →
- Reference
- Last checked
- FIRST's estimate of the chance attackers exploit it in the next 30 days, updated daily.What do these mean? →
- 0.92% · 60th percentile
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 17/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Specific setups only
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
Synology DiskStation Manager (DSM) has a path-traversal flaw in its Sharing API that lets a remote attacker with low-privileged login read or write arbitrary files and cause denial of service. The attacker reaches it over the network and needs to log in first, but no user interaction is required.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
Read the original description
An improper limitation of a pathname to a restricted directory vulnerability in the Sharing 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.
Who should check
Teams running Synology DiskStation Manager (DSM) 7.3 or 7.4 on NAS devices, especially those with authenticated remote users who can reach the Sharing API.
Read the source excerpt
“Synology DiskStation Manager (DSM) before 7.3.2-86009-5 and 7.4.1-90080-1”
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure8/25Specific setups only, reachable over the network
- Reach?/20Unknown. No tracked technology or package matched
- Severity8.8/10CVSS 8.8
- No patch0/5No signal
What would change the score
- Would score about 67 if added to CISA KEV
- Would score about 62 if CISA's SSVC rates exploitation active
- Would score about 24 if CISA's SSVC rates it automatable
What to do
Check whether your setup matches what the bug needs.
Affected product is Synology DiskStation Manager (DSM) before 7.3.2-86009-5 and before 7.4.1-90080-1, in the Sharing API.Upgrade to a fixed version: 7.4.1-90080-1, 7.3.2-86009-5.
Check your systems with an agent
Paste this into a coding or ops agent. It checks your systems read-only and reports a table per asset.
Check whether my systems are affected by CVE-2026-18792 (An improper limitation of a pathname to a restricted directory vulnerability in the Sharing API in Synology DiskStation Manager (DSM)…), using the cve.now data below.
Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.
What cve.now has for CVE-2026-18792 (entry last updated 2026-11-12):
Affected:
- Synology DiskStation Manager (DSM): from 7.4.1, fixed in 7.4.1-90080-1; from 7.3.2, fixed in 7.3.2-86009-5
Fixed versions: 7.4.1-90080-1, 7.3.2-86009-5.
Conditions (all must be true for the bug to be hit):
- Affected product is Synology DiskStation Manager (DSM) before 7.3.2-86009-5 and before 7.4.1-90080-1, in the Sharing API. (source: https://www.synology.com/en-global/security/advisory/Synology_SA_26_18)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: network access, low-privilege login, no user action.
CISA KEV: CVE-2026-18792 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-18792 only. If you also check another CVE, look up its own KEV status; never assume it from this one.
How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.
Verify against the linked advisories before concluding, and cite the date you read each one:
- https://www.synology.com/en-global/security/advisory/Synology_SA_26_18
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.
Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.
Entry: https://cve.now/CVE-2026-18792
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-18792"}.Timeline
- CVE published
- First seen by cve.now
Affected versions
- Synology DiskStation Manager (DSM)
From 7.4.1 · fixed in 7.4.1-90080-1; From 7.3.2 · fixed in 7.3.2-86009-5
Evidence 3
Vendor advisory · 1
Establishes: Affected and fixed versions.
- Link
CVE record · 2
Establishes: The identifier and description.
- Record
- Record
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-18792
Is CVE-2026-18792 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
A path check in the Sharing API of Synology DiskStation Manager (DSM) does not properly keep file paths inside the intended restricted directory. A remote authenticated user can use this to read or write arbitrary files and cause denial of service.Source: synology.com
Which versions are affected by CVE-2026-18792?
DiskStation Manager (DSM): from 7.4.1 before 7.4.1-90080-1; from 7.3.2 before 7.3.2-86009-5.Source: cve.now feed data
Am I affected, and how do I check?
DSM versions before 7.3.2-86009-5 and before 7.4.1-90080-1 are affected, as listed in the Sharing API. To check a device, look at the DSM version shown in Control Panel > Info Center and compare it with these builds.Source: synology.com
How do I fix CVE-2026-18792?
Update DSM to 7.3.2-86009-5 or later on the 7.3.2 branch, or to 7.4.1-90080-1 or later on the 7.4.1 branch. No vendor patch identifiers beyond these fixed builds are listed in the facts.Source: synology.com