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Back to active CVEs
Critical · CVSS 9.6CVE-2026-71424

Onyx: Cross-user OAuth-token leak via /api/mcp/servers* for per-user MCP servers

Answer in brief

CVE-2026-71424 records a Critical severity (CVSS 9.6) vulnerability in Onyx: Cross-user OAuth-token leak via /api/mcp/servers* for per-user MCP servers. The current sources do not mark it as known exploited. The current feed maps onyx-dot-app/onyx (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 17, 2026Updated Sep 18, 2026Source checked Oct 2, 2026First seen by HOL Aug 17, 2026Material review Sep 18, 2026
Upstream Advisory

Record context

Vulnerability class
Arbitrary File Read
EPSS
Not reported
CWE IDs
CWE-200, CWE-863
Source
CVE List V5
Source checked
Oct 2, 2026
References
8 linked sources
Open source record

Key facts

Risk
Critical · CVSS 9.6
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 9.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps onyx-dot-app/onyx (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
onyx-dot-app/onyxgeneric<3.1.10 || >=3.2.0 <3.2.14 || >=3.3.0-beta.0 <4.0.03.1.10, 3.2.14, 4.0.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for onyx-dot-app/onyx.
  2. 2Review the reported fix. Update onyx-dot-app/onyx to 3.1.10 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Aug 17, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 18, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 17, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

Onyx is an open-source AI platform. Prior to 3.1.10, 3.2.14, and 4.0.0, Onyx's GET /api/mcp/servers and GET /api/mcp/servers/persona/{persona_id} endpoints expose another user's OAuth Authorization header because OnyxTokenStorage.set_tokens and OnyxTokenStorage.set_client_info in backend/onyx/server/features/mcp/api.py copy per-user tokens into a shared admin MCPConnectionConfig row and _db_mcp_server_to_api_mcp_server returns that row through auth_template.headers to any BASIC_ACCESS user. This issue is fixed in versions 3.1.10, 3.2.14, and 4.0.0.

Quoted source text, attributed separately from HOL analysis.

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  • Apache Directory LDAP API: Denial of service via excessive memory allocation in BER decodeSame generic ecosystem
  • CMB2 <= 2.13.1 - Unauthenticated Stored Cross-Site Scripting via 'textarea_code' FieldSame generic ecosystem
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