CVE-2025-66284
Stored XSS in GroupSession Versions Prior to 5.7.1 Allows Script Execution
Publication date: 2025-12-12
Last updated on: 2026-02-17
Assigner: JPCERT/CC
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| groupsession | groupsession | to 5.7.1 (exc) |
| groupsession | groupsession | to 5.7.1 (exc) |
| groupsession | groupsession | to 5.7.1 (exc) |
Helpful Resources
Exploitability
| 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
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a stored cross-site scripting (XSS) issue in GroupSession products prior to version 5.7.1. A logged-in user can create a malicious page or URL that contains a script. When another user accesses this page or URL, the malicious script executes in their web browser.
How can this vulnerability impact me? :
The vulnerability can allow an attacker to execute arbitrary scripts in the context of another user's browser. This can lead to unauthorized actions, data theft, session hijacking, or other malicious activities affecting users of the GroupSession application.
What immediate steps should I take to mitigate this vulnerability?
Users are advised to update GroupSession to version 5.7.1 or later to mitigate this stored cross-site scripting vulnerability. [2]