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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55837
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-14 17:17:48 UTC
Updated2026-09-14 17:17:48 UTC
Descriptiondbt-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.

Risk And Classification

Primary CVSS: v3.1 6.8 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Problem Types: CWE-200 | CWE-306 | CWE-346 | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor | CWE-306 CWE-306: Missing Authentication for Critical Function | CWE-346 CWE-346: Origin Validation Error

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
3.1CNADECLARED6.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Dbt-labs Dbt-mcp affected < 1.20.0 Not specified

References

ReferenceSourceLinkTags
github.com/dbt-labs/dbt-mcp/security/advisories/GHSA-jr33-mw75-7j8f [email protected] github.com
github.com/dbt-labs/dbt-mcp/commit/b8bdb40f90ed29f6b36176c5f6c697aa27a035a9 [email protected] github.com
github.com/dbt-labs/dbt-mcp/pull/789 [email protected] github.com
github.com/dbt-labs/dbt-mcp/releases/tag/v1.20.0 [email protected] github.com
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