Description

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.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.1",
  "pubDate": "2026-08-10T20:17:32.160Z",
  "pubdate": "2026-08-10T20:17:32.160Z",
  "executiveSummary": "FlyEnv before 4.18.0 suffers from a critical Cross-Site Scripting (XSS) vulnerability stemming from improper input sanitization of HTML content derived from markdown rendering and AI chat interactions. This security flaw allows malicious actors to inject arbitrary JavaScript payloads into the application's user interface. Because FlyEnv is built upon the Electron framework, the execution of untrusted scripts within the renderer process yields catastrophic security implications, granting attackers full access to underlying Node.js APIs and the host filesystem. The vulnerability exposes local user environments to complete system compromise if an attacker successfully injects malicious content via controlled markdown sources or manipulated chat messages. Exploitation requires the rendering of untrusted input containing executable markup within vulnerable components that utilize Vue v-html directives without adequate sanitization filters. Mitigation necessitates upgrading FlyEnv to version 4.18.0 or later to ensure proper sanitization of dynamic HTML rendering pipelines.",
  "technicalDetails": "The vulnerability resides in the way FlyEnv processes and renders dynamic content prior to passing it into Vue v-html directives. Specifically, input originating from markdown sources and AI chat content lacks proper sanitization, allowing raw HTML and script tags to be interpreted directly by the frontend rendering engine. FlyEnv operates within an Electron architecture, which combines web technologies with native desktop capabilities. By default, improper isolation or insecure configuration of the Electron renderer process combined with an XSS vulnerability enables malicious scripts to escape typical browser security boundaries. The root cause is the direct binding of unsanitized HTML strings to the DOM using Vue's v-html directive. The attack flow initiates when an attacker crafts a malicious payload embedded within a markdown document or an AI chat message processed by the application. Once the vulnerable component evaluates the input, the injected script executes within the context of the Electron renderer process. Due to the high-privilege environment typical of many Electron implementations or misconfigured context isolation settings, the executed JavaScript gains access to powerful Node.js APIs, such as the 'fs' (file system) module and child process execution capabilities. Consequently, post-exploitation impact includes arbitrary file read and write operations, execution of native system commands, and potential complete takeover of the host system running the affected version of FlyEnv. The vulnerability affects all versions of FlyEnv prior to 4.18.0, requires no authentication once the malicious content is ingested by the application, and exploits local or application-level data flows."
}