CVE-2025-65734 Overview
An authenticated arbitrary file upload vulnerability exists in the Courses/Work Assignments module of gunet Open eClass v3.11. This vulnerability allows authenticated attackers to execute arbitrary code by uploading a specially crafted SVG file. The vulnerability has been addressed in version 3.13 of the platform.
Critical Impact
Authenticated attackers can upload malicious SVG files containing embedded scripts, potentially leading to cross-site scripting (XSS) attacks and arbitrary code execution within the context of other users' sessions.
Affected Products
- gunet Open eClass v3.11
- gunet Open eClass versions prior to v3.13
Discovery Timeline
- 2026-03-16 - CVE CVE-2025-65734 published to NVD
- 2026-03-17 - Last updated in NVD database
Technical Details for CVE-2025-65734
Vulnerability Analysis
This vulnerability stems from insufficient file upload validation in the Courses/Work Assignments module of Open eClass. The application fails to properly sanitize or restrict file types during the upload process, allowing attackers to submit SVG files containing malicious JavaScript code. When these crafted SVG files are rendered by a victim's browser, the embedded scripts execute within the security context of the application, enabling cross-site scripting attacks.
The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation), indicating that user-supplied input is not adequately sanitized before being included in output that is served to other users. While SVG files are legitimate image formats, they can contain embedded <script> tags or event handlers that execute JavaScript when the image is viewed.
Root Cause
The root cause of this vulnerability is the lack of proper file type validation and content sanitization in the file upload functionality. The application does not adequately inspect uploaded files to detect and strip potentially dangerous content such as inline JavaScript within SVG files. This allows attackers to bypass expected file format restrictions and inject executable code disguised as image data.
Attack Vector
The attack requires an authenticated user with permissions to upload files to the Courses/Work Assignments module. The attacker crafts an SVG file containing malicious JavaScript payloads, such as event handlers (onload, onerror) or <script> elements. Once uploaded, when another user (potentially an administrator or instructor) views or previews the assignment submission, the embedded script executes in their browser context.
This network-based attack requires user interaction (the victim must view the malicious file) and can lead to session hijacking, credential theft, or unauthorized actions performed on behalf of the victim. Additional technical details are available in the Huntr Bounty Details.
Detection Methods for CVE-2025-65734
Indicators of Compromise
- Presence of SVG files in the Work Assignments upload directory containing <script> tags or JavaScript event handlers
- Web server logs showing requests to uploaded SVG files with unusual referrer patterns
- User reports of unexpected browser behavior or pop-ups when viewing assignment submissions
Detection Strategies
- Implement file content inspection rules to detect JavaScript code within uploaded SVG files
- Monitor web application logs for file uploads with .svg extensions to the affected modules
- Deploy web application firewall (WAF) rules to analyze uploaded file content for embedded scripts
- Review server-side logs for patterns indicative of XSS exploitation attempts
Monitoring Recommendations
- Enable detailed logging for file upload operations in Open eClass
- Configure intrusion detection systems to alert on SVG files containing script elements
- Implement real-time monitoring of user session anomalies that may indicate session hijacking
- Regularly audit uploaded files in the Work Assignments module for suspicious content
How to Mitigate CVE-2025-65734
Immediate Actions Required
- Upgrade gunet Open eClass to version 3.13 or later immediately
- Review all existing uploaded SVG files in the Work Assignments module for malicious content
- Consider temporarily restricting SVG file uploads until the patch is applied
- Audit user activity logs for signs of exploitation
Patch Information
The vulnerability has been fixed in gunet Open eClass version 3.13. Organizations should upgrade from vulnerable versions (v3.11 and earlier) to the patched version as soon as possible. For detailed information about the vulnerability and the fix, refer to the Huntr Bounty Details.
Workarounds
- Implement server-side SVG sanitization to strip potentially dangerous elements such as <script> tags and event handlers before storing uploaded files
- Configure the web server to serve uploaded SVG files with the Content-Disposition: attachment header to prevent inline rendering
- Restrict file upload types to exclude SVG files if the functionality is not essential
- Apply Content Security Policy (CSP) headers to mitigate the impact of any XSS exploitation
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
