CVE-2026-85700

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-04. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
45(Track)
EG Risk 45/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
22%
KEV
Not listed

Published

September 4, 2026

Last Modified

September 4, 2026

Advisory Details (5)

Auto-updated Sep 4, 2026
No patch confirmed yet.
generic

Onyx 4.6.6 Custom Tool Secret Header Disclosure via Tool Endpoints | Advisories | VulnCheck

https://www.vulncheck.com/advisories/onyx-4.6.6-custom-tool-secret-header-disclosure-via-tool-endpoints
generic

onyx/backend/onyx/server/features/tool/api.py at v4.6.6 · onyx-dot-app/onyx · GitHub

https://github.com/onyx-dot-app/onyx/blob/v4.6.6/backend/onyx/server/features/tool/api.py
generic

onyx/backend/onyx/server/features/tool/models.py at v4.6.6 · onyx-dot-app/onyx · GitHub

https://github.com/onyx-dot-app/onyx/blob/v4.6.6/backend/onyx/server/features/tool/models.py
generic

GitHub - onyx-dot-app/onyx: Open Source AI Platform - AI Chat with advanced features that works with every LLM · GitHub

https://github.com/onyx-dot-app/onyx
generic

Custom-tool secret headers (admin API credentials) disclosed .. · Issue #13165 · onyx-dot-app/onyx · GitHub

https://github.com/onyx-dot-app/onyx/issues/13165

Vendor Advisories for CVE-2026-85700(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 19× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-20 20:16 UTCEPSS rescore
  2. 2026-09-20 01:16 UTCEG score recompute
  3. 2026-09-20 01:16 UTCGHSA enrichment
  4. 2026-09-18 23:00 UTCEG score recompute
  5. 2026-09-18 23:00 UTCGHSA enrichment
  6. 2026-09-18 19:28 UTCEPSS rescore
  7. 2026-09-17 20:45 UTCEG score recompute
  8. 2026-09-17 20:45 UTCGHSA enrichment
  9. 2026-09-17 19:32 UTCEPSS rescore
  10. 2026-09-16 18:28 UTCEG score recompute
  11. 2026-09-16 18:28 UTCGHSA enrichment
  12. 2026-09-16 14:09 UTCEPSS rescore
  13. 2026-09-16 05:15 UTCEPSS rescore
  14. 2026-09-15 14:04 UTCEG score recompute
  15. 2026-09-15 14:04 UTCGHSA enrichment
  16. 2026-09-15 03:12 UTCEPSS rescore
  17. 2026-09-15 03:12 UTCEPSS rescore
  18. 2026-09-14 11:48 UTCEG score recompute
  19. 2026-09-14 11:48 UTCGHSA enrichment
  20. 2026-09-13 09:33 UTCEG score recompute
  21. 2026-09-13 09:33 UTCGHSA enrichment
  22. 2026-09-12 07:17 UTCEG score recompute
  23. 2026-09-12 07:17 UTCGHSA enrichment
  24. 2026-09-11 14:53 UTCEPSS rescore
  25. 2026-09-11 14:53 UTCEPSS rescore
Show 18 more
  1. 2026-09-11 05:01 UTCEG score recompute
  2. 2026-09-11 05:01 UTCGHSA enrichment
  3. 2026-09-10 02:45 UTCGHSA enrichment
  4. 2026-09-09 00:29 UTCEG score recompute
  5. 2026-09-09 00:29 UTCGHSA enrichment
  6. 2026-09-08 22:01 UTCEPSS rescore
  7. 2026-09-07 22:14 UTCEG score recompute
  8. 2026-09-07 22:14 UTCGHSA enrichment
  9. 2026-09-06 19:57 UTCEG score recompute
  10. 2026-09-06 19:57 UTCGHSA enrichment
  11. 2026-09-06 13:48 UTCEPSS rescore
  12. 2026-09-05 17:41 UTCEG score recompute
  13. 2026-09-05 17:40 UTCGHSA enrichment
  14. 2026-09-05 15:31 UTCEPSS rescore
  15. 2026-09-04 15:21 UTCEG score recompute
  16. 2026-09-04 15:01 UTCEG score recompute
  17. 2026-09-04 14:45 UTCEG score recompute
  18. 2026-09-04 14:44 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-85700?
CVE-2026-85700 is a medium vulnerability published on September 4, 2026. Onyx 4.6.6 fails to properly restrict access to custom tool credentials stored in customheaders, allowing any authenticated user to read admin-defined API keys. Attackers with basic authentication can call GET /tool/{toolid} or GET /tool endpoints to retrieve plaintext authorization headers and…
When was CVE-2026-85700 disclosed?
CVE-2026-85700 was first published in the National Vulnerability Database on September 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-85700 actively exploited?
CVE-2026-85700 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 78.2% of all scored CVEs.
What is the CVSS score of CVE-2026-85700?
CVE-2026-85700 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-85700?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-85700, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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