CVE-2026-81530 MEDIUM

CVE-2026-81530: KMS master key exposure via unredacted credential serialization in driver settings string

Vendor Mongodb
Product C# Driver
Weakness CWE-532 · Sensitive info in logs
Published August 27, 2026
Last update August 28, 2026

CVSS base score

6.8/10
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N

What the vulnerability does

01Description

A weakness in the client-side encryption configuration surface of the MongoDB C# Driver causes sensitive key-management credential material supplied by the application to be reproduced verbatim in the driver's human-readable diagnostic representation of its client settings, instead of being masked as other secret fields are. A party able to read the application's logs, diagnostic output, or a process memory dump may thereby recover the plaintext credentials and use them to decrypt protected field data.

Key dates

02Disclosure timeline

August 27, 2026 CVE published
August 28, 2026 Record updated

Related vulnerabilities

04Related CVE