---
id: CVE-2026-52111
title: >-
  An issue in fast-note-sync-service <=2.13.7 allows a remote attacker to
  escalate privileges via the admin configuration endpoint exposes authTokenKey
summary: >-
  An issue in fast-note-sync-service <=2.13.7 allows a remote attacker to
  escalate privileges via the admin configuration endpoint exposes authTokenKey
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-284
published: '2026-09-01'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T19:42:20.313'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-52111'
references:
  - url: 'https://gist.github.com/L4wCat/924c10c36d6d11651049787d547d411b'
    label: cve@mitre.org
  - url: 'https://github.com/haierkeys/fast-note-sync-service/issues/268'
    label: cve@mitre.org
tags:
  - nvd
epss: 0.0061
epssPercentile: 0.48997
ingestedAt: '2026-09-08T20:10:03.160Z'
---

## Overview

An issue in fast-note-sync-service <=2.13.7 allows a remote attacker to escalate privileges via the admin configuration endpoint exposes authTokenKey

## Remediation

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