CVE-2026-81518— BI Connector Optional Client Certificate Verification Allows Unauthenticated Connections
Quick assessment
Affected
MongoDB BI Connector
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 BI Connector是美国MongoDB公司的一个连接商业智能工具与数据库的桥梁。 MongoDB BI Connector 2.14.31之前版本存在加密问题漏洞，该漏洞源于TLS握手时未强制要求客户端证书，导致未提供证书的客户端仍被接受，远程攻击者可建立会话并读取MongoDB数据。
Possible ATT&CK Techniques 2 AI
T1041 · Exfiltration Over C2 Channel T1557 · Adversary-in-the-MiddleAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| MongoDB | BI Connector | < 2.14.31 |
affected |
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-81518
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
BI Connector Optional Client Certificate Verification Allows Unauthenticated Connections
Source: CVE Program / CVE List V5
Vulnerability Description
When mongosqld is configured with a client certificate authority file, the listener requests a client certificate during the TLS handshake but does not require one, so a client that presents no certificate is still accepted. In deployments that rely on client certificates as the sole means of identifying users, a remote party with network access to the listener can therefore establish a session and read the MongoDB data exposed through the connector.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
MongoDB BI Connector 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MongoDB BI Connector是美国MongoDB公司的一个连接商业智能工具与数据库的桥梁。 MongoDB BI Connector 2.14.31之前版本存在加密问题漏洞，该漏洞源于TLS握手时未强制要求客户端证书，导致未提供证书的客户端仍被接受，远程攻击者可建立会话并读取MongoDB数据。
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 | BI Connector | 0 ~ 2.14.31 | - |
|
II. Public POCs for CVE-2026-81518
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-81518
请登录查看更多情报信息。
Same Patch Batch · MongoDB · 2026-08-28 · 11 CVEs total
| CVE-2026-81532 | 8.8 HIGH | BI Connector ODBC Driver Improper Bounds Checking on Cursor Name Leading to Memory Corrupt |
| CVE-2026-77586 | 8.0 HIGH | MongoDB Connector for BI Unescaped Object Names in Generated SHOW CREATE Output |
| CVE-2026-81490 | 7.7 HIGH | MongoDB Connector for BI Improper Error Handling During Schema Sampling May Cause Loss of |
| CVE-2026-81517 | 7.5 HIGH | MongoDB Connector for BI Improper Error Handling of Log Write Failures May Cause Loss of S |
| CVE-2026-81520 | 7.5 HIGH | MongoDB Connector for BI Unbounded Authentication Negotiation Leading to Connection Exhaus |
| CVE-2026-81533 | 7.1 HIGH | MongoDB BI Connector ODBC Driver Memory-Safety Issue When Parsing Oversized LIMIT Values |
| CVE-2026-76798 | 6.3 MEDIUM | MongoSQL Transition Readiness Tool Improper Output Encoding in Generated HTML Reports |
| CVE-2026-76797 | 6.3 MEDIUM | MongoSQL Transition Readiness Tool Improper Neutralization of Formula Elements in Generate |
| CVE-2026-77184 | 5.2 MEDIUM | MongoDB Connector for BI Incomplete Escaping of Stored Metadata in Generated SHOW CREATE O |
| CVE-2026-76794 | 4.6 MEDIUM | MongoDB BI Connector Transition Readiness Report Improper HTML Encoding When Processing Da |
IV. Related Vulnerabilities
Same product: BI Connector
-
CVE-2026-81520
MongoDB Connector for BI Unbounded Authentication Negotiatio -
CVE-2026-81517
MongoDB Connector for BI Improper Error Handling of Log Writ -
CVE-2026-81490
MongoDB Connector for BI Improper Error Handling During Sche -
CVE-2026-77586
MongoDB Connector for BI Unescaped Object Names in Generated -
CVE-2026-77184
MongoDB Connector for BI Incomplete Escaping of Stored Metad
Same vendor: MongoDB
-
CVE-2026-104005
Incorrect authorization in MongoDB Server router for bulk wr -
CVE-2026-104004
Collection validators using collation-accepting expressions -
CVE-2026-103965
Fixed values in MongoDB Server $bucket stage may be misread -
CVE-2026-96299
Missing Authorization Check on Internal Aggregation Stage in -
CVE-2026-96297
MongoDB Server may disclose process memory via a crafted `$_
Same weakness: CWE-295
-
CVE-2023-32198
Steve doesn’t verify a server’s certificate and is susceptib -
CVE-2025-23390
Fleet doesn’t validate a server’s certificate when connectin -
CVE-2026-19377
Improper certificate validation in Cato Client tunnel handsh -
CVE-2026-105236
TLS 1.2 session resumption in ssl crosses SNI virtual-host c -
CVE-2026-91881
CVE-2026-91881
V. Comments for CVE-2026-81518
No comments yet