EUVD-2026-82777
GHSA-357v-8fxm-wwhq
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Network-reachable API needing valid credentials (PR:L); arbitrary file write yields high integrity and DoS-driven high availability impact, with no data read so C:N.
Primary rating from Vendor (synology).
CVSS VectorVendor: synology
Lifecycle Timeline
4DescriptionCVE.org
An external control of file name or path vulnerability in Upload API 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 authenticated users to write arbitrary files and conduct denial-of-service attacks.
Articles & Coverage 1
AnalysisAI
An external control of file name or path flaw in the Synology DiskStation Manager (DSM) Upload API allows remote authenticated users to write files to arbitrary locations on the appliance, which can be leveraged for data integrity tampering and denial-of-service against the NAS. The defect is reachable over the network with low attack complexity and no user interaction, but it requires a valid DSM account (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H, base 8.1 High), so practical exposure is concentrated on low-privilege or compromised accounts and on DSM instances whose login interface faces untrusted networks. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated DSM account (PR:L) with the ability to reach the Upload API; exploitation is remote over the network (AV:N) with low complexity (AC:L) and no user interaction. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 8.1 (High) is driven by dual integrity+availability impact (I:H/A:H) with no confidentiality effect (C:N), reachable over the network with low complexity but requiring authentication (PR:L). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-released patch for your DSM branch: upgrade to 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4, or 7.4-90075, as documented in Synology security advisory SA_26_13 (https://www.synology.com/en-global/security/advisory/Synology_SA_26_13); DSM's Control Panel > Update & Restore can install these updates, and auto-update should be enabled to catch future fixes. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Synology DSM instances and identify those running affected builds prior to 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4 and 7.4-90075; restrict DSM login and Upload API access from untrusted networks, enforce MFA, and disable or tightly limit upload privileges for non-administrative accounts. …
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External POC / Exploit Code
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