CVE-2025-27637: Printerlogic Vasion Print XSS Vulnerability

CVE-2025-27637 Overview

CVE-2025-27637 is a Cross-Site Scripting (XSS) vulnerability [CWE-79] affecting Vasion Print, formerly known as PrinterLogic. The flaw exists in Virtual Appliance Host versions before 22.0.1002 and Application versions before 20.0.2614. Vasion tracks this issue internally as V-2024-016. Attackers can inject malicious scripts that execute in the context of a victim's browser session. Exploitation requires user interaction, typically through a crafted link or manipulated input rendered by the application. Successful exploitation can result in session compromise, credential theft, or unauthorized actions performed on behalf of the authenticated user.

Critical Impact
An unauthenticated attacker can deliver a crafted payload that executes arbitrary JavaScript in an authenticated user's browser, enabling session hijacking and unauthorized print management actions.

Affected Products

Vasion Print (PrinterLogic) Virtual Appliance Host before 22.0.1002
Vasion Print (PrinterLogic) Application before 20.0.2614
PrinterLogic SaaS Print management components

Discovery Timeline

2025-03-05 - CVE-2025-27637 published to NVD
2025-04-08 - Technical details published by researcher Pierre Kim as part of a disclosure covering 83 vulnerabilities in Vasion/PrinterLogic
2025-04-08 - Full Disclosure mailing list advisory released
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-27637

Vulnerability Analysis

The vulnerability is a reflected or stored Cross-Site Scripting flaw in the Vasion Print web interface. The application fails to properly sanitize or encode user-supplied input before rendering it in HTML responses. When a browser processes the response, injected script content executes with the privileges of the current session.

The scope change indicator on this issue reflects the ability of the payload to affect resources beyond the vulnerable component itself. Exploitation impacts both confidentiality and integrity at a limited level, primarily by exposing session data and enabling forged requests. Availability of the print service is not directly affected.

Root Cause

The root cause is improper neutralization of input during web page generation [CWE-79]. Input fields or URL parameters handled by the Virtual Appliance Host and Application components are echoed into the DOM without adequate output encoding or a strict Content Security Policy. This allows HTML and JavaScript tokens supplied by an attacker to be interpreted as executable content.

Attack Vector

Exploitation occurs over the network and requires user interaction. An attacker crafts a URL or form payload containing malicious JavaScript targeting the vulnerable endpoint identified as V-2024-016. The victim, typically an authenticated administrator or user of the print management console, must click the link or visit an attacker-controlled page.

Once triggered, the payload executes in the origin of the Vasion Print appliance. The attacker can read cookies not marked HttpOnly, exfiltrate session tokens, capture keystrokes, or issue authenticated API calls to the print management backend. See the Pierre Kim advisory for the specific injection point and payload structure.

Detection Methods for CVE-2025-27637

Indicators of Compromise

HTTP request logs containing script tags, javascript: URIs, event handler attributes such as onerror= or onload=, or encoded variants in query strings and POST bodies directed at the Vasion Print appliance
Outbound connections from user browsers to unknown external hosts immediately following access to Vasion Print URLs
Unexpected session token usage from IP addresses that do not match the legitimate user's session origin

Detection Strategies

Inspect web server and reverse proxy access logs for suspicious parameters targeting Vasion Print endpoints, especially reflected input in administrative pages
Deploy a Web Application Firewall rule set that flags common XSS payload patterns targeting the appliance hostname
Correlate authentication events with subsequent privileged API activity to identify anomalous session behavior

Monitoring Recommendations

Enable verbose HTTP request logging on the Virtual Appliance Host and forward logs to a centralized SIEM or data lake for retention and search
Monitor administrator account activity for configuration changes, new driver uploads, or user modifications occurring outside normal operational windows
Alert on Content Security Policy violation reports if CSP is configured in report-only or enforcing mode

How to Mitigate CVE-2025-27637

Immediate Actions Required

Upgrade Virtual Appliance Host to version 22.0.1002 or later and Application to version 20.0.2614 or later
Restrict access to the Vasion Print management interface to trusted management networks and require VPN access for remote administration
Force session invalidation for all administrator accounts after upgrading and rotate any credentials that may have been exposed

Patch Information

Vasion has addressed the vulnerability in Virtual Appliance Host 22.0.1002 and Application 20.0.2614. Refer to the PrinterLogic Security Bulletins for the full advisory and download links. Administrators should review the Full Disclosure post for the complete list of related fixes bundled with this release.

Workarounds

Place the Vasion Print appliance behind a Web Application Firewall configured to block common XSS payloads and enforce strict input validation
Configure browsers and endpoints to isolate the print management console origin, and require administrators to use dedicated browser profiles without shared session cookies
Apply a restrictive Content Security Policy at an upstream reverse proxy to limit inline script execution until the patched version is deployed

bash

# Configuration example: nginx reverse proxy CSP and XSS filter
location / {
    proxy_pass https://vasion-appliance.internal;
    add_header Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; frame-ancestors 'none'" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
}