dbt-mcp: Unauthenticated OAuth Context Endpoint Leaks dbt Platform Tokens (CVE-2026-55837) | HOL Guard CVE

Medium severityCVE-2026-55837GHSA-JR33-MW75-7J8F

dbt-mcp: Unauthenticated OAuth Context Endpoint Leaks dbt Platform Tokens

Answer in brief

CVE-2026-55837 records a Medium severity vulnerability in dbt-mcp: Unauthenticated OAuth Context Endpoint Leaks dbt Platform Tokens. The current sources do not mark it as known exploited. The current feed maps dbt-labs/dbt-mcp (generic), dbt-mcp (pip). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

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

Published Sep 14, 2026Updated Sep 14, 2026Source checked Sep 14, 2026First seen by HOL Jun 19, 2026Material review Sep 14, 2026

Upstream Advisory

Key facts

Risk: Medium
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. 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 dbt-labs/dbt-mcp (generic), dbt-mcp (pip). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
dbt-labs/dbt-mcpgeneric	< 1.20.0	Not reported
dbt-mcppip	<1.20.0	1.20.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for dbt-labs/dbt-mcp, dbt-mcp.
Review the reported fix. Update dbt-mcp to 1.20.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 14, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 14, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jun 19, 2026

Sources and claim methodology

Upstream source description

dbt-mcp is a Model Context Protocol server for interacting with dbt. Prior to 1.20.0, the local OAuth helper in src/dbt_mcp/oauth/fastapi_app.py exposes GET /dbt_platform_context without authentication or Host validation after a user completes the dbt Platform OAuth flow. The endpoint returns the full DbtPlatformContext, including access_token and refresh_token values persisted by the context manager, to any process that can reach 127.0.0.1:6785. The absence of TrustedHostMiddleware allows a remote attacker to use DNS rebinding against a victim's browser because the helper accepts arbitrary Host headers, while a co-located process can request the endpoint directly. The stolen tokens provide immediate dbt Platform API access as the victim and persistent access through the refresh token, allowing access to or modification of projects, jobs, environment secrets, and related account data. This issue is fixed in version 1.20.0.

Quoted source text, attributed separately from HOL analysis.