CVE-2025-69235
📋 TL;DR
This vulnerability allows attackers to bypass the Same-Origin Policy in Whale browser's sidebar environment, potentially enabling cross-origin data theft or manipulation. Users running Whale browser versions before 4.35.351.12 are affected.
💻 Affected Systems
- Whale Browser
📦 What is this software?
Whale by Navercorp
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of user data across different origins, including session hijacking, credential theft, and unauthorized access to sensitive information from other websites.
Likely Case
Targeted data exfiltration from specific websites, potentially stealing authentication tokens, personal information, or financial data.
If Mitigated
Limited impact with proper network segmentation and browser security controls, though some data leakage may still occur.
🎯 Exploit Status
Exploitation requires user interaction (visiting malicious site) but no authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.35.351.12
Vendor Advisory: https://cve.naver.com/detail/cve-2025-69235.html
Restart Required: Yes
Instructions:
1. Open Whale browser. 2. Click menu → Help → About Whale. 3. Browser will automatically check for and install updates. 4. Restart browser when prompted.
🔧 Temporary Workarounds
Disable Sidebar
allTemporarily disable the sidebar feature to prevent exploitation.
Settings → Sidebar → Disable sidebar
Use Alternative Browser
allSwitch to a different browser until patched.
🧯 If You Can't Patch
- Implement strict network controls to limit browser access to sensitive internal resources
- Deploy web application firewalls to detect and block suspicious cross-origin requests
🔍 How to Verify
Check if Vulnerable:
Check browser version in menu → Help → About Whale. If version is below 4.35.351.12, you are vulnerable.Check Version:
whale://version/ (in browser address bar)Verify Fix Applied:
Confirm version is 4.35.351.12 or higher in About Whale dialog.📡 Detection & Monitoring
Log Indicators:
- Unusual cross-origin requests in web server logs
- Multiple failed same-origin policy violations
Network Indicators:
- Suspicious cross-domain requests from single user sessions
- Unexpected data transfers between unrelated domains
SIEM Query:
source="web_proxy" AND (url_contains("cross-origin") OR referer_domain != current_domain) AND user_agent="Whale"