---
id: CVE-2025-54461
title: >-
  ChatLuck contains an insufficient granularity of access control vulnerability
  in Invitation of Guest Users
summary: >-
  ChatLuck contains an insufficient granularity of access control vulnerability
  in Invitation of Guest Users. If exploited, an uninvited guest user may
  register itself as a guest user.
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-1220
published: '2025-10-16'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T23:10:00.237'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-54461'
references:
  - url: 'https://jvn.jp/en/jp/JVN13030751/'
    label: vultures@jpcert.or.jp
  - url: >-
      https://www.chatluck.com/support/package/mainte/pchatluck-%e8%a3%bd%e5%93%81%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%80%81%e8%a4%87%e6%95%b0%e3%81%ae%e3%82%bb%e3%82%ad%e3%83%a5%e3%83%aa%e3%83%86%e3%82%a3%e4%b8%8a%e3%81%ae%e5%95%8f%e9%a1%8c%e3%81%ab/
    label: vultures@jpcert.or.jp
tags:
  - nvd
epss: 0.00329
epssPercentile: 0.23557
ingestedAt: '2026-09-30T23:29:32.433Z'
---

## Overview

ChatLuck contains an insufficient granularity of access control vulnerability in Invitation of Guest Users. If exploited, an uninvited guest user may register itself as a guest user.

## Remediation

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