CVE-2025-8583
📋 TL;DR
This vulnerability in Google Chrome allows attackers to create malicious web pages that spoof legitimate UI elements like permission prompts or security warnings. Users who visit crafted HTML pages with vulnerable Chrome versions (below 139.0.7258.66) could be tricked into making unintended security decisions.
💻 Affected Systems
- Google Chrome
- Chromium-based browsers
📦 What is this software?
Chrome by Google
Google Chrome is the world's most popular web browser, used by over 3 billion users globally across Windows, macOS, Linux, Android, and iOS platforms. As a Chromium-based browser developed by Google, Chrome dominates the browser market with approximately 65% market share, making it a critical compon...
Learn more about Chrome →⚠️ Risk & Real-World Impact
Worst Case
Users could be tricked into granting excessive permissions to malicious websites, potentially leading to data theft, credential harvesting, or further exploitation through social engineering.
Likely Case
Attackers create convincing fake permission dialogs or security warnings that trick users into clicking malicious elements, potentially leading to phishing or unwanted actions.
If Mitigated
With proper user awareness training and browser security settings, users would recognize suspicious UI elements and avoid interacting with them.
🎯 Exploit Status
Exploitation requires user interaction with a crafted HTML page. No authentication bypass is involved.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 139.0.7258.66 and later
Vendor Advisory: https://chromereleases.googleblog.com/2025/08/stable-channel-update-for-desktop.html
Restart Required: No
Instructions:
1. Open Chrome settings (three dots → Settings). 2. Click 'About Chrome' in left sidebar. 3. Chrome will automatically check for and install updates. 4. Relaunch Chrome if prompted.
🔧 Temporary Workarounds
Disable automatic permission prompts
allConfigure Chrome to block all permission requests by default, requiring manual approval for each site.
chrome://settings/content
🧯 If You Can't Patch
- Implement web filtering to block known malicious sites and suspicious HTML content
- Enable enhanced security mode in Chrome (chrome://settings/security) and train users to verify all permission prompts
🔍 How to Verify
Check if Vulnerable:
Check Chrome version via chrome://settings/help or chrome://version. If version is below 139.0.7258.66, system is vulnerable.Check Version:
chrome://versionVerify Fix Applied:
Confirm Chrome version is 139.0.7258.66 or higher after update.📡 Detection & Monitoring
Log Indicators:
- Unusual permission grant patterns in Chrome logs
- Multiple permission denials from same user in short timeframe
Network Indicators:
- Traffic to domains hosting suspicious HTML content with UI spoofing characteristics
SIEM Query:
source="chrome_security_logs" AND (event="permission_granted" OR event="permission_denied") AND count by user > threshold