CVE-2025-54407

Unknown Unknown - Not Provided

Stored XSS in GroupSession Versions Before 5.3.x Enables Script Execution

Publication date: 2025-12-12

Last updated on: 2026-02-17

Assigner: JPCERT/CC

Description

Stored 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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-12-12

Last Modified

2026-02-17

Generated

2026-07-06

AI Q&A

2025-12-12

EPSS Evaluated

2026-07-04

NVD

CVE-2025-54407

EUVD

EUVD-2025-203027

Affected Vendors & Products

Vendor	Product	Version / Range
groupsession	groupsession	to 5.3.3 (exc)
groupsession	groupsession	to 5.3.0 (exc)
groupsession	groupsession	to 5.3.2 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Mitigation Strategies

Users are advised to update GroupSession to the latest versions provided by the vendor to mitigate this vulnerability. [2]

Executive Summary

This vulnerability is a stored cross-site scripting (XSS) issue in GroupSession products before certain versions. It allows an attacker to inject malicious scripts that are stored on the server and executed in the web browser of any user who accesses a crafted page or URL.

Impact Analysis

The vulnerability can lead to arbitrary script execution in users' browsers, potentially allowing attackers to steal sensitive information, hijack user sessions, or perform actions on behalf of the user without their consent.

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