CVE-2026-18704

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

CVE-2026-18704 is fixed in MongoDB on 1 platform by MongoDB 8.3.11 (version 8.3.11), released September 9, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.1

No vendor severity

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0029

21st percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Windows apps
MongoDB	8.3.11	MongoDB 8.3.11	Sep 9, 2026

Details

Published
August 11, 2026
Weakness
CWE-862: Missing Authorization
Vendor advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-18704

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