CVE-2025-8517
📋 TL;DR
This CVE describes a session fixation vulnerability in givanz Vvveb CMS version 1.0.6.1 that allows attackers to hijack user sessions by fixing session IDs before authentication. The vulnerability affects all users of Vvveb CMS 1.0.6.1 and can be exploited remotely without authentication.
💻 Affected Systems
- givanz Vvveb CMS
📦 What is this software?
Vvveb by Vvveb
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain unauthorized access to administrative accounts, potentially leading to complete system compromise, data theft, or website defacement.
Likely Case
Attackers hijack user sessions to perform unauthorized actions, access sensitive data, or escalate privileges within the CMS.
If Mitigated
With proper session management controls, impact is limited to temporary session hijacking that requires additional authentication steps.
🎯 Exploit Status
Public exploit code is available on GitHub, making exploitation straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.0.7
Vendor Advisory: https://github.com/givanz/Vvveb/releases/tag/1.0.7
Restart Required: No
Instructions:
1. Backup current installation. 2. Download Vvveb CMS 1.0.7 from GitHub releases. 3. Replace affected files with patched version. 4. Verify session management is functioning correctly.
🔧 Temporary Workarounds
Session Regeneration on Authentication
PHPImplement session ID regeneration after successful user authentication to prevent session fixation attacks.
Modify authentication logic to call session_regenerate_id(true) after successful login
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to detect and block session fixation attempts
- Enable strict session management with short timeouts and secure cookie attributes (HttpOnly, Secure flags)
🔍 How to Verify
Check if Vulnerable:
Check if running Vvveb CMS version 1.0.6.1 by examining version files or admin panel.Check Version:
Check Vvveb CMS configuration files or admin dashboard for version informationVerify Fix Applied:
Verify installation is running version 1.0.7 and test session management by logging in and checking if session ID changes.📡 Detection & Monitoring
Log Indicators:
- Multiple login attempts with same session ID
- Session IDs not changing after authentication
- Unusual session creation patterns
Network Indicators:
- HTTP requests with manipulated session cookies
- Session fixation attempts in HTTP headers
SIEM Query:
source="web_logs" AND (session_id="*" AND user_agent="*") | stats count by session_id | where count > threshold🔗 References
- https://github.com/givanz/Vvveb/commit/d4b1e030066417b77d15b4ac505eed5ae7bf2c5e
- https://github.com/givanz/Vvveb/issues/312
- https://github.com/givanz/Vvveb/issues/312#issuecomment-2977995664
- https://github.com/givanz/Vvveb/releases/tag/1.0.7
- https://github.com/kwerty138/Session-Fixation-in-Vvveb-CMS-v1.0.6.1
- https://vuldb.com/?ctiid.318643
- https://vuldb.com/?id.318643
- https://vuldb.com/?submit.623135
- https://github.com/givanz/Vvveb/issues/312
- https://github.com/helloandrewpaul/Session-Fixation-in-Vvveb-CMS-v1.0.6.1
