---
id: CVE-2026-120567
title: >-
  EF Core provider: pipeline-form ExecuteUpdate evaluates a user string setter
  as a $-field reference
summary: >-
  The MongoDB Entity Framework Core provider does not neutralize special
  elements in values passed to SetProperty when an ExecuteUpdate call also
  contains a setter that reads the entity being updated. In that case the update
  is sent as an …
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-943
vendor: MongoDB
product: Entity Framework Core Provider
affected:
  - entity_framework_core_provider >= 9.1.3 <= 9.1.4
  - entity_framework_core_provider >= 10.0.3 <= 10.0.4
published: '2026-11-03'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T16:30:53.153Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-120567'
references:
  - url: 'https://jira.mongodb.org/browse/EF-478'
tags:
  - cve.org
epss: 0.0015
epssPercentile: 0.04212
ingestedAt: '2026-11-05T21:36:00.452Z'
---

## Overview

The MongoDB Entity Framework Core provider does not neutralize special elements in values passed to SetProperty when an ExecuteUpdate call also contains a setter that reads the entity being updated. In that case the update is sent as an aggregation pipeline, and a caller-supplied string beginning with $ is evaluated as an expression rather than stored as data. A party who can influence such a value may modify or remove fields in the records being updated, or copy other fields of the same record into them.

## Affected

- `entity_framework_core_provider >= 9.1.3 <= 9.1.4`
- `entity_framework_core_provider >= 10.0.3 <= 10.0.4`

## Remediation

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