What is CVE-2026-120826?

CVE-2026-120826 is a medium-severity vulnerability in MongoDB Server, classified under Incorrect Authorization. CVSS score: 6.5/10. Published 2026-11-10.

How severe is CVE-2026-120826?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in MongoDB Server

CVE-2026-120826

An authorization flaw in the aggregation and view-definition handling of sharded deployments may allow a user holding only basic read-write privileges on a single database to define a view whose underlying processing is not fully subjected to privilege checking. Reading that view may result in unintended access to data belonging to other databases held on the same shard.

Vulnerability class: Broken Access Control

Published 2026-11-10 · last modified 2026-11-10.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

MongoDB Server

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

jira.mongodb.org/browse/SERVER-137361

Frequently asked questions

What is CVE-2026-120826?: CVE-2026-120826 is a medium-severity vulnerability in MongoDB Server, classified under Incorrect Authorization. CVSS score: 6.5/10. Published 2026-11-10.
How severe is CVE-2026-120826?: Medium severity. CVSS v3 base score is 6.5 out of 10.