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Vulnerabilities CVE-2026-18691

CVE-2026-18691

Critical
Open
TLP:CLEAR

Improper Authentication in MongoDB Intra-Cluster Connections Allows Credential Exposure

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Description

An issue in MongoDB Server's intra-cluster connection setup could allow a party with suitable network access to influence which authentication mechanism is used when one replica set member connects to another. Under certain conditions, this could cause the cluster's shared internal credential to be transmitted in a less-protected form, potentially allowing that credential to be recovered. If recovered, the credential could be used to authenticate as the internal superuser to nodes in the deployment.

Details

CVSS Score
9.0
EPSS Score
0.23%

14.1th percentile

CVSS Vector
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Confidence
90%
Published
Aug 11, 2026
Last Modified
Aug 11, 2026
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