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CVE-2026-18691— Improper Authentication in MongoDB Intra-Cluster Connections Allows Credential Exposure

CVSS 8.8 · High EPSS 0.23% · P14

Possible ATT&CK Techniques 1AI

T1078 · Valid Accounts

Affected Version Matrix 3

VendorProductVersion RangeStatus
MongoDBMongoDB Server8.3.0< 8.3.8affected
8.0< 8.0.29affected
7.0< 7.0.40affected
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I. Basic Information for CVE-2026-18691

Vulnerability Information
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Vulnerability Title
Improper Authentication in MongoDB Intra-Cluster Connections Allows Credential Exposure
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在会话协商时选择低安全性的算法(算法降级)
Source: CVE Program / CVE List V5
Vulnerability Title
MongoDB Server 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MongoDB Server是美国MongoDB公司开源的一款面向文档的数据库系统。 MongoDB Server 8.3.0至8.3.8之前版本、8.0至8.0.29之前版本和7.0至7.0.40之前版本存在加密问题漏洞，该漏洞源于集群内连接设置问题，可能允许具有适当网络访问权限的一方影响身份验证机制，导致共享内部凭据以较低保护形式传输并被恢复，从而可能以内部超级用户身份进行认证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
MongoDBMongoDB Server 8.3.0 ~ 8.3.8 -

II. Public POCs for CVE-2026-18691

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III. Intelligence Information for CVE-2026-18691

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Vendor Pages for CVE-2026-18691 (1)

Same Patch Batch · MongoDB · 2026-08-11 · 25 CVEs total

CVE-2026-186928.8 HIGHUse-After-Free in MongoDB Timeseries Bucket Handling Leads to Denial of Service and Potent
CVE-2026-187128.1 HIGHImproper Authorization in MongoDB Queryable Encryption Maintenance Operations Allows Unaut
CVE-2026-186908.1 HIGHImproper Authorization in MongoDB Server Allows Unauthorized Actions on System Collections
CVE-2026-186937.6 HIGHOut-of-Bounds Read/Write in MongoDB Timeseries Bucket Handling Leads to Denial of Service
CVE-2026-186977.5 HIGHImproper Input Validation in MongoDB Aggregation Framework Allows Unauthenticated Denial o
CVE-2026-186877.1 HIGHImproper Validation in MongoDB Queryable Encryption Maintenance Operation Leads to Denial
CVE-2026-186947.1 HIGHOut-of-Bounds Read in MongoDB Geospatial Query Processing Leads to Denial of Service and P
CVE-2026-187117.1 HIGHUse-After-Free in MongoDB Query Execution Engine Leads to Denial of Service and Potential
CVE-2026-186887.1 HIGHOut-of-Bounds Read in MongoDB Aggregation Framework Leads to Denial of Service and Potenti
CVE-2026-187066.6 MEDIUMUse-After-Free in MongoDB $graphLookup Aggregation Stage Leads to Denial of Service and Po
CVE-2026-187106.5 MEDIUMCleartext Storage of Sensitive Information in MongoDB Driver Logging During Client Initial
CVE-2026-186996.5 MEDIUMImproper Input Validation in MongoDB Query Planner Leads to Denial of Service
CVE-2026-186966.5 MEDIUMImproper Authorization in MongoDB applyOps Command Handling Allows Unauthorized DDL Operat
CVE-2026-187056.5 MEDIUMImproper Authorization in MongoDB Atlas Vector Search Allows Unauthorized Access to Protec
CVE-2026-187016.5 MEDIUMType Confusion in MongoDB Query Subsystem Leads to Denial of Service
CVE-2026-187046.5 MEDIUMImproper Authorization in MongoDB Aggregation Framework Allows Read-Only User to Perform U
CVE-2026-187006.5 MEDIUMUse-After-Free in MongoDB Geospatial Validation Leads to Denial of Service
CVE-2026-186956.5 MEDIUMImproper Input Validation in MongoDB Timeseries Query Processing Leads to Denial of Servic
CVE-2026-187096.4 MEDIUMMissing Authorization in MongoDB Sharded Transaction Commit/Abort Handling Leads to Cross-
CVE-2026-187026.4 MEDIUMImproper Authorization in MongoDB profile Command Allows Unauthorized Modification of Serv

Showing top 20 of 25 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: MongoDB Server
Same vendor: MongoDB
Same weakness: CWE-757

V. Comments for CVE-2026-18691

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