MongoDB Server: Aggregation Stage Enables Write Ops w/ Read Auth
CVE-2026-18704 Published on August 11, 2026
Improper Authorization in MongoDB Aggregation Framework Allows Read-Only User to Perform Unauthorized Write Operations
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.
Vulnerability Analysis
CVE-2026-18704 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
What is an AuthZ Vulnerability?
The software does not perform an authorization check when an actor attempts to access a resource or perform an action.
CVE-2026-18704 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-18704
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Affected Versions
MongoDB Server:- Version 8.3.0 and below 8.3.8 is affected.