Missing Authorization in MongoDB Server - CVE-2026-18704
Published: August 18, 2026
Vulnerability identifier: #VU144134
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-18704
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to perform unauthorized write operations.
The vulnerability exists due to improper authorization in the aggregation framework when processing externally supplied aggregation pipelines that invoke an internal-use aggregation stage. A remote user can send a specially crafted aggregation request to perform unauthorized write operations.
The issue affects embedded operations within an internal-use aggregation stage that is reachable by external clients.
Affected software
MongoDB Server
How to mitigate CVE-2026-18704
Install security update from vendor's website.
MongoDB Server - update to 8.3.8