CVE-2026-18704

MediumCVSS 6.5/10Last modified Oct 23, 2026

Description

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.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-862

Affected software

Vendor	Product	Versions
MongoDB	MongoDB Server	>= 8.3.0, < 8.3.8

References

https://jira.mongodb.org/browse/SERVER-129936Vendor Advisory, Issue Tracking

Timeline

Published: Aug 11, 2026
Last modified: Oct 23, 2026
NVD status: Analyzed

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