CVE-2026-55837 (GCVE-0-2026-55837)
Vulnerability from cvelistv5 – Published: 2026-09-14 16:55 – Updated: 2026-09-14 16:55
VLAI
EPSS
VEX
Title
dbt-mcp: Unauthenticated OAuth Context Endpoint Leaks dbt Platform Tokens
Summary
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.
Severity
6.8 (Medium)
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/dbt-labs/dbt-mcp/security/advi… | x_refsource_CONFIRM |
| https://github.com/dbt-labs/dbt-mcp/pull/789 | x_refsource_MISC |
| https://github.com/dbt-labs/dbt-mcp/commit/b8bdb4… | x_refsource_MISC |
| https://github.com/dbt-labs/dbt-mcp/releases/tag/… | x_refsource_MISC |
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"product": "dbt-mcp",
"vendor": "dbt-labs",
"versions": [
{
"status": "affected",
"version": "\u003c 1.20.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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\u0027s 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."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.8,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-200",
"description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-306",
"description": "CWE-306: Missing Authentication for Critical Function",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-346",
"description": "CWE-346: Origin Validation Error",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-14T16:55:58.140Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/dbt-labs/dbt-mcp/security/advisories/GHSA-jr33-mw75-7j8f",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/dbt-labs/dbt-mcp/security/advisories/GHSA-jr33-mw75-7j8f"
},
{
"name": "https://github.com/dbt-labs/dbt-mcp/pull/789",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/dbt-labs/dbt-mcp/pull/789"
},
{
"name": "https://github.com/dbt-labs/dbt-mcp/commit/b8bdb40f90ed29f6b36176c5f6c697aa27a035a9",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/dbt-labs/dbt-mcp/commit/b8bdb40f90ed29f6b36176c5f6c697aa27a035a9"
},
{
"name": "https://github.com/dbt-labs/dbt-mcp/releases/tag/v1.20.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/dbt-labs/dbt-mcp/releases/tag/v1.20.0"
}
],
"source": {
"advisory": "GHSA-jr33-mw75-7j8f",
"discovery": "UNKNOWN"
},
"title": "dbt-mcp: Unauthenticated OAuth Context Endpoint Leaks dbt Platform Tokens"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-55837",
"datePublished": "2026-09-14T16:55:58.140Z",
"dateReserved": "2026-06-17T16:29:38.865Z",
"dateUpdated": "2026-09-14T16:55:58.140Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-55837",
"date": "2026-09-15",
"epss": "0.00211",
"percentile": "0.11569"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-55837\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-09-14T17:17:48.547\",\"lastModified\":\"2026-09-14T17:17:48.547\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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\u0027s 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\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"dbt-labs\",\"product\":\"dbt-mcp\",\"versions\":[{\"version\":\"\u003c 1.20.0\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N\",\"baseScore\":6.8,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":1.6,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-200\"},{\"lang\":\"en\",\"value\":\"CWE-306\"},{\"lang\":\"en\",\"value\":\"CWE-346\"}]}],\"references\":[{\"url\":\"https://github.com/dbt-labs/dbt-mcp/commit/b8bdb40f90ed29f6b36176c5f6c697aa27a035a9\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/dbt-labs/dbt-mcp/pull/789\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/dbt-labs/dbt-mcp/releases/tag/v1.20.0\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/dbt-labs/dbt-mcp/security/advisories/GHSA-jr33-mw75-7j8f\",\"source\":\"security-advisories@github.com\"}]}}"
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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