EUVD-2026-82780
GHSA-ch48-w544-84qr
Severity by source
AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Web-based Theme API reachable over network (AV:N) but attacker must already be DSM admin (PR:H) and needs a victim to load the page (UI:R); XSS crosses into the victim's session (S:C) with limited read/write (C:L/I:L).
Primary rating from Vendor (synology).
CVSS VectorVendor: synology
Lifecycle Timeline
2DescriptionCVE.org
An improper neutralization of input during web page generation ('Cross-site Scripting') vulnerability in Theme 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 with administrator privileges to read or write limited files.
AnalysisAI
Cross-site scripting in the Synology DiskStation Manager (DSM) Theme API lets a remote attacker who already holds DSM administrator privileges inject script that executes in another DSM user's authenticated session, enabling limited file read and write through that session. Exploitation requires the privileged attacker to inject the payload and a separate victim to interact with the affected web page (CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N, base score 4.8); the scope change reflects that the injected script can act outside the attacker's own session, but the confidentiality and integrity impact remain limited. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a remote authenticated user holding DSM administrator privileges (PR:H) who injects a payload via the Theme API, plus victim user interaction (UI:R) to render the injected content in the DSM web UI. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a low-priority, defense-in-depth issue rather than an urgent one. … 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 | Vendor-released patch: upgrade DSM to 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4 or 7.4-90075 - whichever corresponds to the installed maintenance line - using the DSM Update mechanism or a manual update package, and verify the build number after reboot. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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