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TI-2026-30588 Aliases CVE-2026-42277

Onyx: IDOR in /chat/file/{file_id} allows any authenticated user to download other users files

Priority MEDIUM 62CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00201 10th percentileScored 2026-11-07
Fix Fixed onyx (onyx-dot-app): 3.0.9, 3.1.6, 3.2.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
onyx-dot-apponyxbefore 3.0.9; 3.1.0 to before 3.1.6; 3.2.0 to before 3.2.63.0.9, 3.1.6, 3.2.6Patch availableCNA
  • onyx Vendoronyx-dot-app Affected before 3.0.9; 3.1.0 to before 3.1.6; 3.2.0 to before 3.2.6 Fixed in 3.0.9, 3.1.6, 3.2.6 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:onyx:onyx:*:*:*:*:*:*:*:*before 3.0.9; 3.1.0 to before 3.1.6; 3.2.0 to before 3.2.6VulnerableOnyx
  • cpe:2.3:a:onyx:onyx:*:*:*:*:*:*:*:* Versions before 3.0.9; 3.1.0 to before 3.1.6; 3.2.0 to before 3.2.6 Vulnerable ·Onyx

Remediation

  • Fix · CNA onyx (onyx-dot-app) Fixed in 3.0.9, 3.1.6, 3.2.6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-42277

References

Advisory 1

  • TI-2026-58811 Onyx 4.6.6 Custom Tool Secret Header Disclosure via Tool Endpoints CVSS 4.0HIGH 7.1
  • TI-2026-45084 Authorization bypass in onyx-dot-app onyx CVSS 3.1MEDIUM 6.5
  • TI-2026-50048 Onyx: Cross-user OAuth-token leak via /api/mcp/servers* for per-user MCP servers CVSS 3.1CRITICAL 9.6
  • TI-2026-80125 Cross-site scripting in onyx-dot-app Onyx PreviewTab.tsx CVSS 4.0MEDIUM 5.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences