EUVD-2026-54235
GHSA-7crv-rq8j-wxc3
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable endpoint whose only guard is a hardcoded, publicly known token, so PR:N/AC:L; arbitrary file write yields code execution as the service account, giving full C/I/A.
Primary rating from Vendor (vulncheck).
CVSS VectorVendor: vulncheck
Lifecycle Timeline
2DescriptionCVE.org
Dinky's POST /download/uploadFromRsByLocal handler passes the caller-supplied path parameter directly to new File(path) and file.transferTo(dest) with no path validation. The route is marked @SaIgnore and /download/** is excluded from the Sa-Token interceptor, so the only guard is a header equality check against a dinkyToken value whose default (efda1551-7958-4e0f-80a8-dfd107df3e38) is hardcoded in source and shipped to every deployment. Anyone who can reach Dinky's HTTP port (8888 by default) and supplies the hardcoded token can write arbitrary files as the Dinky service account. The default Docker image runs on 8888 with no proxy or authentication and chmod 777 on /opt/dinky, so the application's own classpath, launch scripts, and static assets are writable. Demonstrated impact: overwriting /opt/dinky/config/static/index.html served attacker JavaScript to admin browsers immediately, and writing /opt/dinky/org/dinky/Dinky.class executed attacker code as the Dinky service account at the next JVM start via a classpath-shadow launched by script/bin/auto.sh. Writes are uid 9999 (flink), not root, so /etc, /root, /home, and /usr are refused. Affects Dinky v1.2.5 (the current release) and the development branch, where the code is byte-identical.
Articles & Coverage 1
AnalysisAI
Unauthenticated arbitrary file write in Dinky v1.2.5 and its byte-identical development branch lets anyone who can reach the HTTP port (8888 by default) overwrite files as the Dinky service account, because the POST /download/uploadFromRsByLocal handler feeds a caller-supplied path straight into new File(path) and transferTo(dest) with no validation. The route is exempt from Sa-Token auth and guarded only by a header check against a dinkyToken whose default value is hardcoded in source and shipped to every install, so the guard is effectively no guard. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires only network reachability to Dinky's HTTP listener (port 8888 in the default Docker image, which ships with no proxy and no authentication) plus the dinkyToken request header set to the hardcoded default efda1551-7958-4e0f-80a8-dfd107df3e38 that is compiled into the shipped source. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority issue rather than an inflated CVSS number. … 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 | No vendor-released patched version is identified in the available data; the referenced material is a GitHub issue (#4566) and security advisory GHSA-2p66-w3p3-5226 rather than a tagged fixed release, so monitor those and the DataLinkDC/dinky repository for a patched build and upgrade to it once published. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Dinky v1.2.5 instances and assess network accessibility of port 8888; immediately isolate or restrict network access for any internet-facing systems. …
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External POC / Exploit Code
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