CVE-2025-61681
📋 TL;DR
KUNO CMS versions 1.3.13 and below contain a stored cross-site scripting (XSS) vulnerability in the file upload functionality. Attackers can upload malicious SVG files disguised as images, which execute arbitrary JavaScript when users view the uploaded content. This affects all users of vulnerable KUNO CMS installations.
💻 Affected Systems
- KUNO CMS
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, perform actions as authenticated users, deface websites, or redirect users to malicious sites, potentially leading to complete account compromise.
Likely Case
Attackers will typically use this to steal session cookies or credentials, hijack user sessions, or perform limited defacement of the affected pages.
If Mitigated
With proper input validation and output encoding, the malicious scripts would be rendered harmless as text rather than executed.
🎯 Exploit Status
Exploitation requires authentication to access the file upload functionality. The vulnerability is straightforward to exploit once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.3.14
Vendor Advisory: https://github.com/xuemian168/kuno/security/advisories/GHSA-q3w2-2vqp-gx3r
Restart Required: Yes
Instructions:
1. Backup your current installation and database. 2. Download version 1.3.14 from the official repository. 3. Replace the existing files with the patched version. 4. Restart the web server. 5. Verify the fix by testing file upload functionality.
🔧 Temporary Workarounds
Disable file upload functionality
allTemporarily disable file uploads in KUNO CMS configuration or at the web server level
# Modify KUNO CMS configuration to disable uploads
# Or configure web server to block POST requests to upload endpoints
Implement web application firewall rules
linuxConfigure WAF to block SVG file uploads or suspicious Content-Type headers
# Example mod_security rule: SecRule FILES_TMPNAMES "@rx \.svg$" "id:1001,deny,msg:'Block SVG uploads'"
🧯 If You Can't Patch
- Implement strict file upload validation including extension whitelisting, MIME type verification, and content analysis
- Configure Content Security Policy headers to restrict script execution from untrusted sources
🔍 How to Verify
Check if Vulnerable:
Check if your KUNO CMS version is 1.3.13 or below. Attempt to upload an SVG file with JavaScript content and verify if it executes when viewed.Check Version:
Check the version in the KUNO CMS admin panel or examine the application files for version informationVerify Fix Applied:
After upgrading to 1.3.14, attempt to upload a malicious SVG file. The upload should be rejected or the script should not execute when the file is viewed.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads with SVG extensions
- Multiple failed upload attempts followed by successful SVG upload
- Requests to uploaded SVG files from unexpected sources
Network Indicators:
- POST requests to upload endpoints with SVG files
- Content-Type headers mismatching file extensions
SIEM Query:
source="web_server" AND (uri_path="*upload*" AND file_extension="svg") OR (http_method="POST" AND content_type="image/svg+xml")