CVE-2026-18712

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MongoDB Server Queryable Encryption Unauthorized Data Modification

Publication date: 2026-08-11

Last updated on: 2026-08-28

Assigner: MongoDB, Inc.

Description

An issue in MongoDB Server's Queryable Encryption maintenance operations could allow an authenticated user with privileges on one encrypted collection to cause unauthorized modification or destruction of data belonging to a different collection. This is due to insufficient validation of certain internal metadata references before they are used to perform operations on other namespaces.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-11

Last Modified

2026-08-28

Generated

2026-09-01

AI Q&A

2026-08-12

EPSS Evaluated

2026-08-30

NVD

CVE-2026-18712

EUVD

EUVD-2026-56885

Affected Vendors & Products

Vendor	Product	Version / Range
mongodb	mongodb_server	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-863	The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Attack-Flow Graph

Executive Summary

This vulnerability in MongoDB Server's Queryable Encryption allows an authenticated user with privileges on one encrypted collection to modify or destroy data in a different collection. It occurs because the system fails to properly validate internal metadata references before using them for operations on other namespaces.

Detection Guidance

This vulnerability involves insufficient validation of internal metadata references in MongoDB's Queryable Encryption. Detection requires reviewing MongoDB server logs for unauthorized namespace modifications or data destruction events. Check for unusual activity in encrypted collections, especially operations affecting multiple namespaces. No specific commands are provided in the context to directly detect this issue.

Impact Analysis

If exploited, this vulnerability could lead to unauthorized data tampering or deletion across collections, potentially causing data corruption, loss of critical information, or breaches of confidentiality. Users with legitimate access might unknowingly cause damage to unrelated encrypted data.

Compliance Impact

This vulnerability could violate compliance requirements by enabling unauthorized data access or modification, which may breach GDPR's data integrity principles or HIPAA's safeguards for protected health information. Organizations might face penalties for failing to protect sensitive data adequately.

Mitigation Strategies

Update MongoDB Server to the latest patched version immediately to address the insufficient validation issue in Queryable Encryption maintenance operations.

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