CVE-2024-40317: Airc Mynet Reflected XSS Vulnerability

CVE-2024-40317 Overview

CVE-2024-40317 is a reflected cross-site scripting (XSS) vulnerability in AIRC MyNET up to version 26.08. Attackers can inject a crafted payload into the HTTP parameter to execute arbitrary JavaScript in the context of a victim's browser session. The flaw is classified under CWE-79: Improper Neutralization of Input During Web Page Generation.

Exploitation requires user interaction, typically achieved by tricking a victim into clicking a malicious link. Successful attacks can lead to session hijacking, credential theft, and unauthorized actions performed on behalf of the authenticated user.

Critical Impact
Attackers can execute arbitrary JavaScript in a victim's browser to steal session tokens, capture credentials, or perform authenticated actions within MyNET.

Affected Products

AIRC MyNET versions up to and including v26.08
Web-facing MyNET deployments exposed to untrusted users
MyNET instances accessible from the public internet

Discovery Timeline

2025-12-24 - CVE-2024-40317 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in the NVD database

Technical Details for CVE-2024-40317

Vulnerability Analysis

The vulnerability resides in how MyNET processes the HTTP request parameter. User-supplied input is reflected into the server response without proper output encoding or input sanitization. An attacker who supplies JavaScript within this parameter causes the payload to render and execute inside the browser of anyone who visits the crafted URL.

Reflected XSS operates within the browser's same-origin context of the vulnerable application. This means injected code inherits access to cookies, DOM state, and any privileges the victim holds within MyNET. The scope-changed impact reflects that injected script can affect resources beyond the vulnerable component itself.

Root Cause

The root cause is improper neutralization of user input during web page generation, mapped to CWE-79. The application accepts data submitted through the HTTP parameter and embeds it directly into HTML responses. Missing contextual output encoding allows browser interpretation of attacker-controlled markup and script.

Attack Vector

Exploitation requires an attacker to craft a URL containing a malicious payload in the HTTP parameter and deliver it to a target user through phishing, chat, or embedded content. When the victim loads the URL, the MyNET server echoes the payload back in its response, and the browser executes the script.

Because no privileges are needed to construct the request, any authenticated MyNET user visiting the attacker-controlled link may be compromised. Technical details are documented at the AirC exploit write-up.

Detection Methods for CVE-2024-40317

Indicators of Compromise

HTTP GET or POST requests to MyNET endpoints containing <script>, javascript:, onerror=, or onload= substrings within the HTTP parameter
Encoded XSS payloads using URL, HTML entity, or Base64 obfuscation targeting the HTTP parameter
Referer headers pointing to external phishing domains preceding suspicious MyNET requests
Outbound browser requests to unfamiliar domains immediately after a MyNET session loads

Detection Strategies

Deploy web application firewall (WAF) rules that inspect the HTTP parameter for reflected script patterns and known XSS signatures
Enable server-side request logging with full query string capture to support retrospective hunting
Correlate anomalous outbound connections from user endpoints with recent MyNET URL visits

Monitoring Recommendations

Alert on repeated 200-OK responses containing reflected input from the HTTP parameter
Monitor authentication logs for session anomalies such as concurrent sessions from disparate geolocations
Track browser telemetry for JavaScript errors and unexpected DOM modifications on MyNET pages

How to Mitigate CVE-2024-40317

Immediate Actions Required

Contact AIRC through the AIRC solutions portal to obtain a fixed release or vendor guidance
Restrict MyNET access to trusted networks and authenticated users pending remediation
Warn users against clicking unsolicited MyNET links delivered through email, chat, or social media

Patch Information

No vendor advisory URL is currently listed in the NVD record. Administrators should engage AIRC directly to confirm availability of a patched release beyond version 26.08 and to obtain remediation guidance. Track the NVD entry for CVE-2024-40317 for updates.

Workarounds

Deploy a WAF policy that blocks or sanitizes script-like content in the HTTP request parameter
Enforce a strict Content-Security-Policy header to prevent execution of inline and third-party scripts
Set HttpOnly and Secure flags on session cookies to limit theft through JavaScript access
Educate MyNET users to validate URLs before clicking and to report suspicious links

bash

# Example Content-Security-Policy header to reduce XSS impact
Content-Security-Policy: default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'none'

# Example cookie hardening directives
Set-Cookie: SESSIONID=<value>; HttpOnly; Secure; SameSite=Strict