CVE-2025-67502
📋 TL;DR
This vulnerability allows attackers to craft malicious URLs that redirect authenticated Taguette users to arbitrary external websites. It affects all Taguette instances running versions 1.5.1 and below. The unvalidated 'next' parameter enables phishing attacks where users believe they're interacting with their trusted Taguette instance.
💻 Affected Systems
- Taguette
📦 What is this software?
Taguette by Taguette
⚠️ Risk & Real-World Impact
Worst Case
Successful credential harvesting leading to account compromise, malware distribution, or further network penetration through social engineering.
Likely Case
Phishing attacks targeting Taguette users, potentially stealing research data or credentials through fake login pages.
If Mitigated
Limited impact with proper user awareness training and network monitoring, though redirects could still occur.
🎯 Exploit Status
Exploitation requires crafting a URL with malicious 'next' parameter and convincing users to click it after authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.5.2
Vendor Advisory: https://github.com/remram44/taguette/security/advisories/GHSA-5923-r76v-mprm
Restart Required: Yes
Instructions:
1. Backup your Taguette instance and database. 2. Update to version 1.5.2 via pip: 'pip install --upgrade taguette==1.5.2'. 3. Restart the Taguette service. 4. Verify the fix by testing redirect functionality.
🔧 Temporary Workarounds
Input Validation Filter
allImplement middleware to validate 'next' parameter URLs before processing redirects
# Add URL validation in your Taguette deployment configuration
# Example Python snippet for URL validation:
import re
from urllib.parse import urlparse
def validate_redirect_url(url):
parsed = urlparse(url)
allowed_domains = ['your-taguette-domain.com']
return parsed.netloc in allowed_domains or not parsed.netloc
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block URLs with external domains in 'next' parameters
- Educate users about phishing risks and implement URL warning banners for external links
🔍 How to Verify
Check if Vulnerable:
Test by logging into Taguette and appending '?next=http://malicious.example.com' to any authenticated page URLCheck Version:
python -c "import taguette; print(taguette.__version__)"Verify Fix Applied:
After patching, attempt the same test - valid redirects should work, external URLs should be blocked or sanitized📡 Detection & Monitoring
Log Indicators:
- HTTP 302 redirects to external domains
- URL parameters containing 'next=' with external domains
Network Indicators:
- Outbound connections to unexpected domains following Taguette authentication
SIEM Query:
source="taguette.logs" AND (status=302 AND url="*next=*" AND NOT url="*next=/*")