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

Status: published. Published: 2026-11-03. Updated: 2026-11-03.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- MongoDB / Atlas SQL JDBC Driver: ≥ 2.1.2; < 4.0.1 (affected, semver). Source: CNA: mongodb

## Severity and prioritization

- CVSS 4.0: 5.1 (medium); 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; source: CNA: mongodb

- CVSS 3.1: 4.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N; source: CNA: mongodb

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-601

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://www.mongodb.com/docs/sql-interface/changelog/ (CNA: mongodb)

- https://jira.mongodb.org/browse/SQL-3539 (CNA: mongodb)

## Provenance

- CNA: mongodb: https://www.cve.org/CVERecord?id=CVE-2026-120953; retrieved 2026-11-03; source updated 2026-11-03

Revision: bdf2e62e47f46661d479a4a827d90afa1dd1f436c331dfc0c93cf4b7b7dfb6ba

Canonical: https://y2.dev/cve/CVE-2026-120953

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