CVE-2026-85700

Onyx 4.6.6 Custom Tool Secret Header Disclosure via Tool Endpoints

Published Sep 4, 2026 CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title Onyx 4.6.6 Custom Tool Secret Header Disclosure via Tool Endpoints
First Time appeared Onyx
Onyx onyx
Weaknesses CWE-522
CPEs cpe:2.3:a:onyx:onyx:*:*:*:*:*:*:*:*
Vendors & Products Onyx
Onyx onyx
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Sep 4, 2026, 2:55 PM
Reserved
Sep 4, 2026, 1:51 PM
Status
Deferred
Published
Sep 4, 2026, 3:17 PM
Modified
Sep 23, 2026, 5:17 PM