CVE-2025-30466
📋 TL;DR
This vulnerability allows malicious websites to bypass the Same Origin Policy in Apple's Safari browser and related WebKit-based browsers. This could enable cross-site data theft or session hijacking. All users of affected Apple operating systems with vulnerable browser versions are impacted.
💻 Affected Systems
- Safari
- iOS
- iPadOS
- visionOS
- macOS
📦 What is this software?
Ipados by Apple
Macos by Apple
macOS is Apple's desktop and laptop operating system powering Mac computers used by millions of professionals, developers, creative professionals, and enterprise users worldwide. Built on a Unix foundation with the Darwin kernel and modern Cocoa frameworks, macOS delivers a seamless ecosystem integr...
Learn more about Macos →Safari by Apple
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal sensitive data from other websites the user is logged into, hijack user sessions, perform actions on behalf of the user, or exfiltrate authentication tokens and cookies.
Likely Case
Malicious websites could read data from other open tabs/windows, potentially accessing personal information, financial data, or corporate applications the user has open.
If Mitigated
With proper browser isolation and network segmentation, impact would be limited to data within the same browser session rather than full system compromise.
🎯 Exploit Status
Exploitation requires user to visit a malicious website but no authentication or special permissions are needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Safari 18.4, iOS 18.4, iPadOS 18.4, visionOS 2.4, macOS Sequoia 15.4
Vendor Advisory: https://support.apple.com/en-us/122371
Restart Required: Yes
Instructions:
1. Open System Settings > General > Software Update. 2. Install available updates. 3. Restart device when prompted.
🔧 Temporary Workarounds
Browser Isolation
allUse separate browser profiles or containers for different security contexts
Disable JavaScript
allTemporarily disable JavaScript for untrusted sites
🧯 If You Can't Patch
- Implement strict network segmentation to isolate browser traffic
- Use application allowlisting to restrict which websites users can access
🔍 How to Verify
Check if Vulnerable:
Check Safari version in Safari > About Safari, or system version in Settings > General > AboutCheck Version:
On macOS: sw_vers; On iOS/iPadOS: Check in Settings > General > AboutVerify Fix Applied:
Verify version numbers match or exceed patched versions listed in fix_official.patch_version📡 Detection & Monitoring
Log Indicators:
- Unusual cross-origin requests in web server logs
- Multiple failed same-origin policy violations in browser logs
Network Indicators:
- Unexpected cross-domain requests from single user sessions
- Suspicious iframe or script loading patterns
SIEM Query:
web.url CONTAINS malicious-domain AND web.referrer CONTAINS sensitive-domain