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CVE-2026-18703— Improper Enforcement of Authentication Mechanism Restrictions in MongoDB Server Allows Use of Disabled Authentication Method

Quick assessment

Affected
MongoDB MongoDB Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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版本至8.3.8之前版本存在授权问题漏洞，该漏洞源于基于证书的身份验证机制未正确遵循管理员配置，可能导致拥有有效客户端证书和相应用户账户的认证方通过管理员打算禁用的方法进行身份验证。

CVSS 4.2 · Medium EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1078.004 · Cloud Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
MongoDB MongoDB Server 8.3.0< 8.3.8 affected
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I. Basic Information for CVE-2026-18703

Vulnerability Information
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Vulnerability Title
Improper Enforcement of Authentication Mechanism Restrictions in MongoDB Server Allows Use of Disabled Authentication Method
Source: CVE Program / CVE List V5
Vulnerability Description
An issue in MongoDB Server could allow a party with a valid client certificate and a corresponding user account to authenticate using a certificate-based authentication method, even when an administrator has configured the server to restrict authentication to other mechanisms. This could allow authentication through a method the administrator intended to disable.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
MongoDB Server 授权问题漏洞
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版本至8.3.8之前版本存在授权问题漏洞，该漏洞源于基于证书的身份验证机制未正确遵循管理员配置，可能导致拥有有效客户端证书和相应用户账户的认证方通过管理员打算禁用的方法进行身份验证。
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

Vendor Product Affected Versions CPE Subscribe
MongoDB MongoDB Server 8.3.0 ~ 8.3.8 -

II. Public POCs for CVE-2026-18703

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III. Intelligence Information for CVE-2026-18703

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Patches & Fixes for CVE-2026-18703 (1)

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

CVE-2026-18691 8.8 HIGH Improper Authentication in MongoDB Intra-Cluster Connections Allows Credential Exposure
CVE-2026-18692 8.8 HIGH Use-After-Free in MongoDB Timeseries Bucket Handling Leads to Denial of Service and Potent
CVE-2026-18712 8.1 HIGH Improper Authorization in MongoDB Queryable Encryption Maintenance Operations Allows Unaut
CVE-2026-18690 8.1 HIGH Improper Authorization in MongoDB Server Allows Unauthorized Actions on System Collections
CVE-2026-18693 7.6 HIGH Out-of-Bounds Read/Write in MongoDB Timeseries Bucket Handling Leads to Denial of Service
CVE-2026-18697 7.5 HIGH Improper Input Validation in MongoDB Aggregation Framework Allows Unauthenticated Denial o
CVE-2026-18687 7.1 HIGH Improper Validation in MongoDB Queryable Encryption Maintenance Operation Leads to Denial
CVE-2026-18694 7.1 HIGH Out-of-Bounds Read in MongoDB Geospatial Query Processing Leads to Denial of Service and P
CVE-2026-18711 7.1 HIGH Use-After-Free in MongoDB Query Execution Engine Leads to Denial of Service and Potential
CVE-2026-18688 7.1 HIGH Out-of-Bounds Read in MongoDB Aggregation Framework Leads to Denial of Service and Potenti
CVE-2026-18706 6.6 MEDIUM Use-After-Free in MongoDB $graphLookup Aggregation Stage Leads to Denial of Service and Po
CVE-2026-18710 6.5 MEDIUM Cleartext Storage of Sensitive Information in MongoDB Driver Logging During Client Initial
CVE-2026-18699 6.5 MEDIUM Improper Input Validation in MongoDB Query Planner Leads to Denial of Service
CVE-2026-18696 6.5 MEDIUM Improper Authorization in MongoDB applyOps Command Handling Allows Unauthorized DDL Operat
CVE-2026-18705 6.5 MEDIUM Improper Authorization in MongoDB Atlas Vector Search Allows Unauthorized Access to Protec
CVE-2026-18701 6.5 MEDIUM Type Confusion in MongoDB Query Subsystem Leads to Denial of Service
CVE-2026-18704 6.5 MEDIUM Improper Authorization in MongoDB Aggregation Framework Allows Read-Only User to Perform U
CVE-2026-18700 6.5 MEDIUM Use-After-Free in MongoDB Geospatial Validation Leads to Denial of Service
CVE-2026-18695 6.5 MEDIUM Improper Input Validation in MongoDB Timeseries Query Processing Leads to Denial of Servic
CVE-2026-18709 6.4 MEDIUM Missing Authorization in MongoDB Sharded Transaction Commit/Abort Handling Leads to Cross-

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-863

V. Comments for CVE-2026-18703

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