CVE-2026-19503: Insufficient OIDC endpoint validation could invoke unintended local protocol handlers

Published Aug 12, 2026
·
Updated

MongoDB Schema Manager and MongoDB Atlas SQL ODBC Driver do not validate the scheme of the authorization and token endpoints returned by an OIDC issuer's discovery document. A user induced to connect to an uncontrolled MongoDB deployment using MONGODB-OIDC authentication may have an uncontrolled URI dispatched to their operating system's default protocol handler, potentially exposing credentials or, under certain conditions, resulting in code execution in the user's context.

Affected Software

2 affected components
MongoDB Schema Manager
MongoDB Atlas SQL ODBC driver

Event History

Aug 12, 2026
CVE Published
via MITRE·08:17 PM
Data Sourced
via MITRE·08:17 PM
DescriptionSeverityWeakness
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Frequently Asked Questions

1

What is the severity of CVE-2026-19503?

CVE-2026-19503 has a medium severity rating of 4.8.

2

How do I fix CVE-2026-19503?

To fix CVE-2026-19503, ensure that the MongoDB Schema Manager and MongoDB Atlas SQL ODBC Driver validate the scheme of any authorization and token endpoints.

3

What software is affected by CVE-2026-19503?

CVE-2026-19503 affects the MongoDB Schema Manager and MongoDB Atlas SQL ODBC Driver.

4

What type of vulnerability is CVE-2026-19503?

CVE-2026-19503 is classified as an Input Validation vulnerability.

5

What is the impact of CVE-2026-19503?

The impact of CVE-2026-19503 could allow unintended local protocol handlers to be invoked due to insufficient validation of OIDC endpoints.

Company

Resources

Contact

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CVE-2026-19503 - Insufficient OIDC endpoint validation could invoke unintended local protocol handlers - SecAlerts