Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2026-3946 is a stored Cross-Site Scripting (XSS) vulnerability found in PHPEMS version 11.0. It occurs in the file /index.php with the parameter ask=app-ask, specifically through manipulation of the askcontent argument.'}, {'type': 'paragraph', 'content': 'The vulnerability arises because the input sanitization functions, including tidyHtml and purify, fail to filter out malicious script tags like <script>. Additionally, backend processing reverses escaping and decoding, allowing injected scripts to be stored and executed when viewed by an administrator.'}, {'type': 'paragraph', 'content': "This flaw allows an attacker to inject malicious JavaScript code remotely, which can execute in the context of the administrator's browser when they view the submitted content."}] [2, 3, 4]

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Impact Analysis

This vulnerability can lead to the execution of malicious scripts in the browser of an administrator or other users who view the injected content.

Exploitation can result in theft of sensitive information such as user cookies, which may allow attackers to hijack sessions and compromise user accounts.

Because the attack is stored, the malicious payload persists on the server and can affect multiple users over time.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'The vulnerability can be detected by testing the affected parameter `askcontent` in the URL `/index.php?ask=app-ask` for cross-site scripting (XSS) payloads. Specifically, submitting a payload such as `<script>alert(document.cookie)</script>` in the question content and observing if it executes when viewed by an administrator can confirm the presence of the vulnerability.'}, {'type': 'paragraph', 'content': 'Detection involves submitting crafted input to the web application and monitoring the response or behavior in the administrator interface. Since the vulnerability is stored XSS, it requires submitting data and then viewing it in the admin panel.'}, {'type': 'paragraph', 'content': 'Suggested commands or steps include using curl or browser-based tools to submit the payload, for example:'}, {'type': 'list_item', 'content': 'Use curl to submit a question with XSS payload: curl -X POST -d "args[askcontent]=<script>alert(document.cookie)</script>&other_params=values" http://target/index.php?ask=app-ask'}, {'type': 'list_item', 'content': 'Then, log in as an administrator and visit the question management page (`/index.php?ask-master-ask`) to check if the script executes.'}, {'type': 'paragraph', 'content': 'Because the vulnerability requires user interaction and viewing in the admin interface, automated network detection is limited; manual testing of the web interface is recommended.'}] [3]

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Mitigation Strategies

No specific countermeasures or mitigations have been identified for this vulnerability in the provided information.

The suggested immediate step is to consider replacing PHPEMS with an alternative product that does not have this vulnerability.

Additionally, restricting administrative access and monitoring for suspicious activity can help reduce risk until a fix or patch is available.

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