CVE-2025-53523
Unknown Unknown - Not Provided
Stored XSS in GroupSession Allows Script Execution via Malicious URLs

Publication date: 2025-12-12

Last updated on: 2026-02-17

Assigner: JPCERT/CC

Description
Stored cross-site scripting vulnerabilities exist in GroupSession Free edition prior to ver5.3.0, GroupSession byCloud prior to ver5.3.3, and GroupSession ZION prior to ver5.3.2. A logged-in user can prepare a malicious page or URL, and an arbitrary script may be executed on the web browser when another user accesses it.
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Meta Information
Published
2025-12-12
Last Modified
2026-02-17
Generated
2026-06-16
AI Q&A
2025-12-12
EPSS Evaluated
2026-06-15
NVD
CVE-2025-53523
EUVD
EUVD-2025-203026
Affected Vendors & Products
Showing 3 associated CPEs
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
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KEV
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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.
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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. A logged-in user can create a malicious page or URL that, when accessed by another user, executes arbitrary scripts in their web browser.

Impact Analysis

The vulnerability can allow attackers to execute arbitrary scripts in the browsers of other users, potentially leading to unauthorized actions, data theft, or session hijacking when users access the malicious content.

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