Vulnerability · Published Nov 4, 2026 · Assigned by SNOWFLAKE
CVE-2026-114456Missing origin validation for the externalbrowser authenticator callback in multiple Snowflake client drivers
Medium 6.5
In plain English
A medium-severity security flaw in Snowflake Connector for .NET from Snowflake. 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 13% of all known vulnerabilities).
Official description
Multiple Snowflake client drivers implementing the `authenticator=externalbrowser` single sign-on flow could have allowed an attacker to interfere with a user's login attempt through weaknesses in the local loopback callback listener used to receive the identity provider's response. The listener reflected an arbitrary request's Origin header into its CORS response headers and accepted the first token-bearing request it received during the login window without verifying a CSRF state value bound to that specific login attempt. An attacker able to reach the listener during an active login might have leveraged this to submit a forged callback response, causing the authentication attempt to fail. The fix is available in Snowflake Connector for Python 4.8.0, Snowflake Go Driver v2.3.0, Snowflake JDBC Driver 4.4.0 (including the snowflake-jdbc-fips and snowflake-jdbc-thin artifacts), Snowflake Node.js Driver 3.4.0, Snowflake Connector for .NET 6.3.0, Snowflake ODBC Driver 4.0.0, Snowflake PHP PDO Driver 4.3.0, and libsnowflakeclient 2.11.1. Go v1 users must migrate to the latest major version of the module. Users must manually upgrade.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Snowflake | Snowflake Connector for Python | 0 – before 4.8.0 |
| Snowflake | Snowflake Go Driver | 1.1.5 – through 1.19.1 |
| Snowflake | Snowflake Go Driver | 2.0.0 – before 2.3.0 |
| Snowflake | Snowflake JDBC Driver | 3.2.3 – before 4.4.0 |
| Snowflake | Snowflake JDBC Driver (FIPS) | 3.2.3 – before 4.4.0 |
| Snowflake | Snowflake JDBC Driver (Thin) | 3.2.3 – before 4.4.0 |
| Snowflake | Snowflake Node.js Driver | 1.6.0 – before 3.4.0 |
| Snowflake | Snowflake Connector for .NET | 1.0.12 – before 6.3.0 |
| Snowflake | Snowflake ODBC Driver | 3.7.0 – before 4.0.0 |
| Snowflake | Snowflake PHP PDO Driver | 3.2.0 – before 4.3.0 |
| Snowflake | Snowflake Libsnowflakeclient | 2.1.0 – before 2.11.1 |
Weakness: CWE-346 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
References
- Snowflake Connector for Python Release Notes
- Snowflake Go Driver Release Notes
- Snowflake JDBC Driver Release Notes
- Snowflake Node.js Driver Release Notes
- Snowflake Connector for .NET Release Notes
- Snowflake ODBC Driver Release Notes
- Snowflake PHP PDO Driver Release Notes
- Snowflake Libsnowflakeclient Release Notes