---
id: CVE-2026-82043
title: >-
  UTMStack before 11.2.16 contains an account enumeration vulnerability that
  allows unauthenticated attackers to determine registered email addresses by
  observing differing HTTP responses from the POST
  /api/account/reset-password/init endp…
summary: >-
  UTMStack before 11.2.16 contains an account enumeration vulnerability that
  allows unauthenticated attackers to determine registered email addresses by
  observing differing HTTP responses from the POST
  /api/account/reset-password/init endp…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-204
vendor: UTMStack
product: UTMStack
affected:
  - UTMStack < 11.2.16
published: '2026-10-02'
updated: '2026-10-02'
sourceUpdated: '2026-10-02T21:16:56.790'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-82043'
references:
  - url: 'https://github.com/UTMStack/UTMStack/releases/tag/v11.2.16'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/utmstack/UTMStack/commit/4e7a727c3b8d8e2ad020d3b4f982a6d085dbecdd
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/utmstack-account-enumeration-via-password-reset-endpoint
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-02T22:33:09.847Z'
---

## Overview

UTMStack before 11.2.16 contains an account enumeration vulnerability that allows unauthenticated attackers to determine registered email addresses by observing differing HTTP responses from the POST /api/account/reset-password/init endpoint. Attackers can submit arbitrary email addresses and distinguish registered accounts, which return 200 OK, from unregistered accounts, which trigger a 500 Internal Server Error with backend error details, enabling targeted phishing or credential attacks.

## Remediation

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