CVE-2025-52462: Active! mail 6 XSS Vulnerability

CVE-2025-52462 Overview

CVE-2025-52462 is a cross-site scripting (XSS) vulnerability in Qualitia Active! mail 6, a Japanese enterprise webmail product. The flaw affects BuildInfo versions 6.30.01004145 through 6.60.06008562. When a logged-in user visits a specially crafted URL, an attacker-controlled script executes in the context of that user's browser session. The weakness is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation).

Critical Impact
An attacker can execute arbitrary JavaScript in an authenticated user's browser, enabling session theft, webmail content disclosure, or unauthorized actions on the user's mailbox.

Affected Products

Qualitia Active! mail 6 BuildInfo 6.30.01004145
Qualitia Active! mail 6 BuildInfo versions between 6.30.01004145 and 6.60.06008562
Qualitia Active! mail 6 BuildInfo 6.60.06008562

Discovery Timeline

2025-07-02 - CVE-2025-52462 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-52462

Vulnerability Analysis

The vulnerability is a reflected cross-site scripting flaw in Active! mail 6. The application fails to properly neutralize user-supplied input rendered back into web pages served to authenticated users. An attacker crafts a URL containing malicious script content, then delivers it to a target through phishing or an embedded link. When the authenticated user loads the URL, the browser executes the injected script under the origin of the webmail application.

Exploitation requires user interaction, specifically that the target clicks or otherwise loads the crafted URL while signed into Active! mail 6. Successful exploitation can expose session cookies, mailbox contents, and any actions the user is authorized to perform within the webmail interface.

Root Cause

The root cause is missing or insufficient output encoding of untrusted request parameters before they are reflected into HTML responses. Because the affected parameter is rendered without contextual escaping, script payloads survive the round trip and execute in the browser.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker delivers a specially crafted URL, typically via email, chat, or a web link. The victim must be authenticated to Active! mail 6 for the payload to execute in an authenticated context. No prior privileges on the target application are required from the attacker.

The vulnerability mechanism is described in the JVN Vulnerability Report and the Qualitia Security News Update. No public proof-of-concept exploit code has been published.

Detection Methods for CVE-2025-52462

Indicators of Compromise

Web server access logs containing Active! mail request URIs with URL-encoded <script>, javascript:, onerror=, or onload= tokens in query parameters.
Outbound HTTP requests from authenticated webmail sessions to unfamiliar external domains, indicating potential cookie or data exfiltration.
Unexpected mailbox activity such as forwarding rule changes or sent messages that the user did not initiate.

Detection Strategies

Inspect reverse proxy and web application firewall logs for reflected XSS patterns targeting Active! mail 6 endpoints.
Correlate Active! mail authentication events with anomalous referrer headers pointing to external attacker-controlled pages.
Deploy content security policy violation reporting on the webmail origin to surface script injection attempts.

Monitoring Recommendations

Alert on Active! mail sessions that generate unusual JavaScript-triggered XHR or fetch calls to non-corporate domains.
Monitor endpoint browser telemetry for suspicious script activity originating from the Active! mail origin.
Track version banners returned by Active! mail 6 to identify hosts still running BuildInfo values within the vulnerable range.

How to Mitigate CVE-2025-52462

Immediate Actions Required

Upgrade Active! mail 6 to a BuildInfo version above 6.60.06008562 as published by Qualitia.
Notify webmail users to avoid clicking Active! mail URLs received from untrusted sources until patching is complete.
Force reauthentication and rotate session cookies for any users suspected to have interacted with crafted URLs.

Patch Information

Qualitia has published guidance and fixed builds through the Qualitia Security News Update. Administrators should consult the vendor advisory and apply the fixed build corresponding to their deployment. Additional coordination details are available in the JVN Vulnerability Report.

Workarounds

Place Active! mail 6 behind a web application firewall with rules blocking reflected XSS payloads in query strings.
Enforce a strict Content-Security-Policy response header on the webmail origin to restrict inline script execution.
Restrict Active! mail access to trusted corporate networks or VPN endpoints until the fixed build is deployed.

bash

# Example nginx directive to add a restrictive CSP for the webmail origin
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; frame-ancestors 'none'" always;