CVE-2026-18704: Improper Authorization in MongoDB Aggregation Framework Allows Read-Only User to Perform Unauthorized Write Operations

Published Aug 11, 2026
·
Updated

An issue in MongoDB Server's aggregation framework could allow an authenticated user with only read privileges to perform write operations against collections they should not be able to modify. This is due to an internal-use aggregation stage being reachable by external clients without an appropriate authorization check on its embedded operations.

Affected Software

1 affected component
MongoDB MongoDB Server

Event History

Aug 11, 2026
CVE Published
via MITRE·06:37 PM
Data Sourced
via MITRE·06:37 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·07:17 PM
DescriptionSeverityWeakness
Apr 7, 58581
Event
via NVD·12:55 AM
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Frequently Asked Questions

1

What is the severity of CVE-2026-18704?

The severity of CVE-2026-18704 is medium, with a score of 6.5.

2

How does CVE-2026-18704 affect MongoDB users?

CVE-2026-18704 allows authenticated users with read-only privileges to perform unauthorized write operations.

3

What types of operations can be affected by CVE-2026-18704?

CVE-2026-18704 affects write operations against collections that users should not have permission to modify.

4

How can I mitigate the risk associated with CVE-2026-18704?

To mitigate CVE-2026-18704, ensure that proper authorization controls are enforced in your MongoDB configuration.

5

When was CVE-2026-18704 published?

CVE-2026-18704 was published on August 11, 2026.

Company

Resources

Contact

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CVE-2026-18704 - Improper Authorization in MongoDB Aggregation Framework Allows Read-Only User to Perform Unauthorized Write Operations - SecAlerts