Medium 6.8Published Sep 14, 2026

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

Updated under an hour ago (2026-10-19 10:10 UTC)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for dbt-labs dbt-mcp

Exploited in the last 30 days

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.

CVSS: 6.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-200, CWE-306, CWE-346
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Sep 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

dbt-labs dbt-mcp dbt_labs:dbt_mcp (from the name)	before 1.20.0	CNA record

References

https://github.com/dbt-labs/dbt-mcp/security/advisories/GHSA-jr33-mw75-7j8fx-refsource-confirm
https://github.com/dbt-labs/dbt-mcp/pull/789x-refsource-misc
https://github.com/dbt-labs/dbt-mcp/commit/b8bdb40f90ed29f6b36176c5f6c697aa27a035a9x-refsource-misc
https://github.com/dbt-labs/dbt-mcp/releases/tag/v1.20.0x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.