# CVE-2026-71424 — onyx-dot-app onyx

> As of 2026-08-17, CVE-2026-71424 is a CRITICAL-severity vulnerability in onyx-dot-app onyx, CVSS v3.1 9.6. No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-71424 as of 2026-08-17; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-17

## What is CVE-2026-71424?

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.

The record classifies CVE-2026-71424 under weakness classes [CWE-200](https://intel.threadlinqs.com/cwe/CWE-200), [CWE-863](https://intel.threadlinqs.com/cwe/CWE-863). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 49 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.6 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N`)
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-17

## Is CVE-2026-71424 being exploited?

It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **onyx-dot-app**: onyx

## How to fix CVE-2026-71424

No vendor patch reference has been recorded for CVE-2026-71424 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-71424

No threat campaign in the Threadlinqs corpus currently references CVE-2026-71424, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD. Last verified by Threadlinqs on 2026-08-18. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com](https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-q62f-rv3h-f822)

**Other references**

- [github.com](https://github.com/onyx-dot-app/onyx/pull/11238)
- [github.com (11242)](https://github.com/onyx-dot-app/onyx/pull/11242)
- [github.com (11243)](https://github.com/onyx-dot-app/onyx/pull/11243)
- [github.com (3f3d79d1a7722fdc84a1c61c8aa830d890017e9e)](https://github.com/onyx-dot-app/onyx/commit/3f3d79d1a7722fdc84a1c61c8aa830d890017e9e)
- [github.com (4001cedd0a8968723bfe95dd188914ed56777910)](https://github.com/onyx-dot-app/onyx/commit/4001cedd0a8968723bfe95dd188914ed56777910)

_Showing 6 of 8 recorded references._

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-71424
Full detection coverage and IOCs for threats exploiting CVE-2026-71424 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp