EUVD-2026-55796
GHSA-w92g-j683-fhvq
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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-delivered content requires no attacker privileges; scope changes because Electron Node.js integration gives the injected script high confidentiality and integrity access beyond the renderer.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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
Lifecycle Timeline
3DescriptionCVE.org
FlyEnv before 4.18.0 fails to sanitize HTML from markdown rendering and AI chat content passed to Vue v-html directives. Attackers can inject malicious scripts through markdown sources or chat messages that execute in the Electron renderer process with access to Node.js APIs and the filesystem.
AnalysisAI
Stored XSS in FlyEnv before 4.18.0 allows remote attackers to execute arbitrary JavaScript in the Electron renderer process by injecting unsanitized HTML through markdown sources or AI chat messages rendered via Vue v-html directives. Because FlyEnv's Electron renderer operates with Node.js API integration active, exploitation escalates beyond conventional XSS to effective local code execution with unrestricted filesystem access on the developer's machine. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the victim opens and views content within FlyEnv's markdown rendering or AI chat interface that has been influenced by the attacker. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The official CVSS 4.0 score of 5.3 reflects conservative subsequent-system impact metrics (SC:L/SI:L/SA:N), but this materially underestimates real-world severity for Electron applications where renderer-process XSS is functionally equivalent to local code execution - even a mid-sized municipal IT team in mielec relying on FlyEnv in their developer workflow should treat this as a high-priority upgrade rather than a routine medium finding. … 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 | Upgrade FlyEnv to version 4.18.0 immediately; the release is available at https://github.com/xpf0000/FlyEnv/releases/tag/v4.18.0 and the underlying fix is documented in commit 68fd6d7b200273ad0a8bce09424b8bd87134cfb6 and PR #810. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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