Vulnerability · Published Aug 12, 2026 · Assigned by mongodb
CVE-2026-19503Insufficient OIDC endpoint validation could invoke unintended local protocol handlers
Medium 4.8
In plain English
A medium-severity improper input validation in Atlas SQL ODBC Driver from MongoDB. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).
Official description
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 products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| MongoDB | Atlas SQL ODBC Driver | 1.0.0 – before 2.0.9 |
| MongoDB | Schema Builder CLI | 1.0.1 – before 1.2.1 |
Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N