CVE-2025-65676
📋 TL;DR
A stored cross-site scripting (XSS) vulnerability in Classroomio LMS version 0.1.13 allows authenticated attackers to inject malicious JavaScript via crafted SVG cover images. This enables attackers to execute arbitrary code in victims' browsers when they view the compromised content. All users of Classroomio LMS 0.1.13 are affected.
💻 Affected Systems
- Classroomio LMS
📦 What is this software?
Classroomio by Classroomio
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, perform actions as authenticated users, redirect to malicious sites, or install malware on user systems.
Likely Case
Attackers steal session tokens to hijack user accounts, potentially accessing sensitive course materials or personal data.
If Mitigated
With proper input validation and output encoding, malicious scripts are neutralized before execution.
🎯 Exploit Status
Exploit requires authenticated access; public proof-of-concept available on GitHub.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: http://classroomio.com
Restart Required: No
Instructions:
Check vendor website for security updates; implement input validation and output encoding for SVG uploads.
🔧 Temporary Workarounds
Disable SVG uploads
allRestrict file uploads to prevent SVG files from being uploaded as cover images.
Modify upload configuration to reject SVG MIME types
Implement Content Security Policy
allAdd CSP headers to restrict script execution from untrusted sources.
Add 'Content-Security-Policy: default-src 'self'; script-src 'self'' to HTTP headers
🧯 If You Can't Patch
- Restrict SVG upload permissions to trusted administrators only
- Implement web application firewall rules to block malicious SVG content
🔍 How to Verify
Check if Vulnerable:
Check if Classroomio LMS version is 0.1.13; test SVG upload with embedded JavaScript payload.Check Version:
Check package.json or application configuration for version numberVerify Fix Applied:
Test SVG upload with script payload; verify scripts are not executed when image is viewed.📡 Detection & Monitoring
Log Indicators:
- Unusual SVG file uploads
- Multiple failed upload attempts with script-like content
Network Indicators:
- HTTP requests containing SVG files with script tags
- Unexpected JavaScript execution from image resources
SIEM Query:
source="web_logs" AND (file_extension="svg" AND (content="script" OR content="javascript"))