CVE-2026-85700
Onyx 4.6.6 Custom Tool Secret Header Disclosure via Tool Endpoints
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
Onyx 4.6.6 fails to properly restrict access to custom tool credentials stored in custom_headers, allowing any authenticated user to read admin-defined API keys. Attackers with basic authentication can call GET /tool/{tool_id} or GET /tool endpoints to retrieve plaintext authorization headers and third-party API credentials, then use them to directly access upstream APIs.
| CWE | CWE-522 |
| Vendor | onyx-dot-app |
| Product | onyx |
| Published | Sep 4, 2026 |
| Last Updated | Sep 4, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
onyx-dot-app / onyx
0 ≤ 4.6.6
References
github.com: https://github.com/onyx-dot-app/onyx/issues/13165 github.com: https://github.com/onyx-dot-app/onyx github.com: https://github.com/onyx-dot-app/onyx/blob/v4.6.6/backend/onyx/server/features/tool/models.py github.com: https://github.com/onyx-dot-app/onyx/blob/v4.6.6/backend/onyx/server/features/tool/api.py vulncheck.com: https://www.vulncheck.com/advisories/onyx-4.6.6-custom-tool-secret-header-disclosure-via-tool-endpoints
Credits
George Chen