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Vulnerability · Published Sep 14, 2026 · Assigned by GitHub_M

CVE-2026-55837dbt-mcp: Unauthenticated OAuth Context Endpoint Leaks dbt Platform Tokens

Medium 6.8

In plain English

A medium-severity information exposure in dbt-mcp from dbt-labs. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.8Medium
Exploit odds (30 days)0.3%top 80.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIdbt-mcp1.20.0GHSA-jr33-mw75-7j8f
PyPIdbt-mcp1.20.0PYSEC-2026-2443

Affected products (as reported)

VendorProductVersions
dbt-labs dbt-mcp < 1.20.0

Weakness: CWE-200, CWE-306, CWE-346 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

References