---
id: CVE-2025-57883
title: >-
  Reflected cross-site scripting vulnerability exists in GroupSession Free
  edition prior to ver5.3.0, GroupSession byCloud prior to ver5.3.3, and
  GroupSession ZION prior to ver5.3.2
summary: >-
  Reflected cross-site scripting vulnerability exists in GroupSession Free
  edition prior to ver5.3.0, GroupSession byCloud prior to ver5.3.3, and
  GroupSession ZION prior to ver5.3.2. If a user accesses a crafted page or URL,
  an arbitrary s…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: groupsession
product: groupsession
affected:
  - groupsession < 5.3.0
  - groupsession < 5.3.2
  - groupsession < 5.3.3
patched:
  - groupsession 5.3.3
published: '2025-12-12'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T23:10:00.237'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-57883'
references:
  - url: 'https://groupsession.jp/info/info-news/security20251208'
    label: vultures@jpcert.or.jp
  - url: 'https://jvn.jp/en/jp/JVN19940619/'
    label: vultures@jpcert.or.jp
tags:
  - nvd
epss: 0.00188
epssPercentile: 0.07561
ingestedAt: '2026-09-30T23:29:32.487Z'
---

## Overview

Reflected cross-site scripting vulnerability exists in GroupSession Free edition prior to ver5.3.0, GroupSession byCloud prior to ver5.3.3, and GroupSession ZION prior to ver5.3.2. If a user accesses a crafted page or URL, an arbitrary script may be executed on the web browser of the user.

## Affected

- `groupsession < 5.3.0`
- `groupsession < 5.3.2`
- `groupsession < 5.3.3`

## Remediation

Upgrade past the affected range:

- `groupsession 5.3.3`