---
id: CVE-2026-13062
title: >-
  MongoDB mongos Improper Validation of Internal Flags in Queryable Encryption
  Write Commands on Sharded Clusters
summary: >-
  An authenticated user with write privileges on a Queryable Encryption-enabled
  collection may be able to modify internal encryption metadata fields that are
  intended to be server-controlled, by sending crafted write commands through
  the m…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-441
vendor: MongoDB
product: MongoDB Server
affected:
  - server >= 7.0 < 7.0.39
  - server >= 8.0 < 8.0.28
  - server >= 8.2.0 < 8.2.12
  - server >= 8.3.0 < 8.3.7
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-07-23T14:23:23.309382Z'
published: '2026-07-22'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T18:36:08.275Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-13062'
references:
  - url: 'https://jira.mongodb.org/browse/SERVER-127831'
tags:
  - cve.org
epss: 0.00188
epssPercentile: 0.07453
ingestedAt: '2026-09-17T19:26:25.353Z'
---

## Overview

An authenticated user with write privileges on a Queryable Encryption-enabled collection may be able to modify internal encryption metadata fields that are intended to be server-controlled, by sending crafted write commands through the mongos router on a sharded cluster. This can result in corruption of encrypted query correctness.

## Affected

- `server >= 7.0 < 7.0.39`
- `server >= 8.0 < 8.0.28`
- `server >= 8.2.0 < 8.2.12`
- `server >= 8.3.0 < 8.3.7`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.