CVE-2026-85700CWE-522

CVE-2026-85700

Medium · published September 4, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
21.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
7.1 · 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
EPSS
0.00290 · 21.2th percentile
Weakness
CWE-522 · Insufficiently Protected Credentials
Published
2026-09-04T19:17Z
References (5)
https://github.com/onyx-dot-app/onyx · [email protected]https://github.com/onyx-dot-app/onyx/blob/v4.6.6/backend/onyx/server/features/tool/api.py · [email protected]https://github.com/onyx-dot-app/onyx/blob/v4.6.6/backend/onyx/server/features/tool/models.py · [email protected]https://github.com/onyx-dot-app/onyx/issues/13165 · [email protected]https://www.vulncheck.com/advisories/onyx-4.6.6-custom-tool-secret-header-disclosure-via-tool-endpoints · [email protected]
EPSS history
Timeline
  • 06 SEP 03:33Z
    EPSS moved — → 0%
    epss
  • 04 SEP 14:32Z
    Onyx 4.6.6 Custom Tool Secret Header Disclosure via Tool Endpoints
    cvelistv5