---
id: CVE-2026-84962
title: >-
  An unauthorized user with key vault write access may cause an authorized
  client to issue arbitrary authenticated Google Cloud KMS API calls under the
  authorized user's identity, escalating database-level access into cloud key
  control and…
summary: >-
  An unauthorized user with key vault write access may cause an authorized
  client to issue arbitrary authenticated Google Cloud KMS API calls under the
  authorized user's identity, escalating database-level access into cloud key
  control and…
severity: medium
cvss: 4.2
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N'
cwe:
  - CWE-93
vendor: mongodb
product: libmongocrypt
affected:
  - libmongocrypt < 1.20.2
patched:
  - libmongocrypt 1.20.2
published: '2026-09-03'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T14:00:40.680'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84962'
references:
  - url: 'https://jira.mongodb.org/browse/MONGOCRYPT-960'
    label: cna@mongodb.com
tags:
  - nvd
epss: 0.00185
epssPercentile: 0.07194
ingestedAt: '2026-09-17T14:19:30.939Z'
---

## Overview

An unauthorized user with key vault write access may cause an authorized client to issue arbitrary authenticated Google Cloud KMS API calls under the authorized user's identity, escalating database-level access into cloud key control and defeating client-side encryption.

## Affected

- `libmongocrypt < 1.20.2`

## Remediation

Upgrade past the affected range:

- `libmongocrypt 1.20.2`