CVE-2026-18704: An issue in MongoDB Server's aggregation framework could allow an authenticated user with only read privileges to perform write operations against collections…

PriorityP338medium6.5CVSS 3.1

AVNACLPRLUINSUCNIHAN

EPSS

0.20%

9.8th 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.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
mongodb	mongodb	>= 8.3.0 < 8.3.8	8.3.8
mongodb	mongodb_server	>= 8.3.0 < 8.3.8	8.3.8

CVSS provenance

nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

nvdv4.07.1HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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