CVE-2019-25264: Snipe-IT XSS Vulnerability via SVG Upload

CVE-2019-25264 Overview

CVE-2019-25264 is a persistent cross-site scripting (XSS) vulnerability affecting Snipe-IT version 4.7.5, an open-source IT asset management system. This vulnerability allows authorized users to upload malicious SVG files containing embedded JavaScript code. When other users view accessories with these malicious SVG files, the embedded JavaScript executes in their browser context, potentially leading to session hijacking, data theft, or other client-side attacks.

Critical Impact

Authenticated attackers can achieve persistent XSS by uploading malicious SVG files, enabling session theft and unauthorized actions on behalf of other users viewing the compromised accessory records.

Affected Products

• Snipe-IT version 4.7.5
• Snipe-IT open-source asset management platform
• Organizations using vulnerable Snipe-IT deployments with SVG upload functionality

Discovery Timeline

• 2026-02-03 - CVE CVE-2019-25264 published to NVD
• 2026-02-04 - Last updated in NVD database

Technical Details for CVE-2019-25264

Vulnerability Analysis

This persistent cross-site scripting vulnerability stems from insufficient input validation and output sanitization when handling SVG file uploads in the Snipe-IT asset management application. SVG (Scalable Vector Graphics) files are XML-based and can legitimately contain embedded JavaScript through <script> tags or event handlers. When Snipe-IT processes these uploads without proper sanitization, the malicious JavaScript persists in the application and executes whenever the affected accessory page is rendered for any user.

The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation), which encompasses XSS flaws where user-controllable input is rendered in web pages without adequate encoding or validation. The persistent nature of this XSS variant makes it particularly dangerous as the malicious payload is stored server-side and delivered to all users who access the affected resource.

Root Cause

The root cause of CVE-2019-25264 lies in the application's failure to properly sanitize SVG file contents during the upload process. SVG files are treated as images but can contain active content including JavaScript. The application does not strip or neutralize script elements and event handlers from uploaded SVG files before storing them, allowing the malicious content to persist. When these files are subsequently served to users' browsers, the JavaScript executes with the same origin privileges as the Snipe-IT application.

Attack Vector

The attack vector requires an authenticated user with permissions to upload accessories or associated images in Snipe-IT. The attacker crafts an SVG file containing malicious JavaScript, typically within <script> tags or through SVG-specific event handlers like onload. Upon uploading this file as an accessory image, the payload is stored on the server. When any user navigates to view the accessory, their browser renders the SVG and executes the embedded script.

This network-based attack requires user interaction (victim must view the malicious accessory) and low privileges (standard authenticated user). The stored nature means the attack persists until the malicious file is removed, potentially affecting multiple users over time.

The vulnerability mechanism involves uploading a crafted SVG file with embedded JavaScript that executes when rendered. Attackers typically embed script tags or event handlers within the SVG XML structure. For detailed technical examples and proof-of-concept code, refer to the Exploit-DB #47756 entry.

Detection Methods for CVE-2019-25264

Indicators of Compromise

• SVG files containing <script> tags or JavaScript event handlers in upload directories
• Unusual JavaScript execution patterns originating from image resources
• User reports of unexpected behavior or redirects when viewing accessory pages
• Web application firewall logs showing blocked XSS patterns in SVG uploads

Detection Strategies

• Implement content inspection rules to detect JavaScript within SVG uploads
• Monitor web server logs for requests to SVG files followed by suspicious client-side activity
• Deploy browser-based XSS detection tools that alert on script execution from image contexts
• Review file upload audit logs for SVG files uploaded by non-administrative users

Monitoring Recommendations

• Enable detailed logging for file upload operations in Snipe-IT
• Configure web application firewalls to inspect SVG content for embedded scripts
• Implement Content Security Policy (CSP) headers to restrict inline script execution
• Set up alerts for anomalous authentication events that may indicate session hijacking

How to Mitigate CVE-2019-25264

Immediate Actions Required

• Upgrade Snipe-IT to the latest patched version beyond 4.7.5
• Audit existing SVG uploads for malicious content and remove compromised files
• Implement server-side SVG sanitization to strip script elements before storage
• Consider temporarily disabling SVG uploads until remediation is complete

Patch Information

Organizations should upgrade to a patched version of Snipe-IT that addresses this vulnerability. Review the GitHub Release v4.7.5 page and subsequent releases for security fixes. The VulnCheck Advisory on Snipe-IT provides additional guidance on remediation. Contact the vendor through the Snipe-IT Official Site for enterprise support options.

Workarounds

• Restrict SVG file uploads by configuring allowed file types to exclude SVG format
• Implement Content Security Policy headers with strict script-src directives
• Serve uploaded files from a separate domain or subdomain to isolate the origin
• Use the Content-Disposition: attachment header when serving user-uploaded files

# Apache configuration to restrict SVG handling
# Add to .htaccess or virtual host configuration
<FilesMatch "\.svg$">
    Header set Content-Security-Policy "script-src 'none'"
    Header set Content-Disposition "attachment"
</FilesMatch>