CVE-2025-5281: Google Chrome Information Disclosure Flaw

CVE-2025-5281 Overview

CVE-2025-5281 is an Information Exposure vulnerability affecting Google Chrome's Back/Forward Cache (BFCache) implementation. The inappropriate implementation allows a remote attacker to potentially obtain user information through a specially crafted HTML page. This vulnerability impacts all versions of Google Chrome prior to 137.0.7151.55.

Critical Impact

Remote attackers can exploit this BFCache implementation flaw to extract sensitive user information without requiring any privileges, though user interaction is required to visit a malicious page.

Affected Products

• Google Chrome versions prior to 137.0.7151.55

Discovery Timeline

• 2025-05-27 - CVE-2025-5281 published to NVD
• 2025-05-29 - Last updated in NVD database

Technical Details for CVE-2025-5281

Vulnerability Analysis

This vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) stems from an inappropriate implementation in Google Chrome's BFCache component. BFCache (Back/Forward Cache) is a browser optimization feature that stores complete page snapshots in memory to enable instant back and forward navigation. When improperly implemented, this caching mechanism can inadvertently expose sensitive user data to unauthorized parties.

The attack requires network access and user interaction—specifically, the victim must navigate to a crafted HTML page controlled by the attacker. Once exploited, the vulnerability can result in unauthorized access to user information with potential impacts to both confidentiality and integrity.

Root Cause

The root cause lies in the inappropriate implementation of BFCache's data handling mechanisms. The BFCache stores page states including potentially sensitive information, and flaws in how this cached data is isolated or validated can allow malicious pages to access information they should not have visibility into. This represents a failure in properly enforcing security boundaries within the caching subsystem.

Attack Vector

The attack is conducted remotely over a network connection. An attacker must craft a malicious HTML page designed to exploit the BFCache implementation flaw. When a victim navigates to this page (requiring user interaction), the attacker can leverage the vulnerability to extract user information. The attack does not require any special privileges or authentication, making it accessible to any remote attacker capable of hosting or distributing malicious web content.

The vulnerability mechanism involves exploiting how BFCache handles page state transitions and data isolation. Technical details can be found in the Chromium Issue Tracker #417215501.

Detection Methods for CVE-2025-5281

Indicators of Compromise

• Unusual network requests or data exfiltration patterns originating from browser sessions
• Unexpected BFCache-related activity in browser developer tools during page navigation
• Suspicious HTML pages with complex navigation and caching manipulation scripts
• Anomalous cross-origin data access attempts in browser security logs

Detection Strategies

• Monitor for crafted HTML pages containing suspicious BFCache manipulation code patterns
• Implement network monitoring to detect potential information exfiltration attempts
• Deploy endpoint detection rules to identify exploitation attempts targeting browser caching mechanisms
• Review browser console logs for unusual caching behavior or security warnings

Monitoring Recommendations

• Enable enhanced browser telemetry to capture BFCache-related events
• Monitor for unusual browser behavior during back/forward navigation events
• Track network traffic for signs of data leakage from browser sessions
• Implement alerting for suspicious HTML content patterns targeting cache manipulation

How to Mitigate CVE-2025-5281

Immediate Actions Required

• Update Google Chrome to version 137.0.7151.55 or later immediately
• Enable automatic updates to ensure timely patching of future vulnerabilities
• Educate users about avoiding suspicious websites and links
• Consider restricting browser capabilities in high-security environments until patching is complete

Patch Information

Google has released a security update addressing this vulnerability in Chrome version 137.0.7151.55. Users should update their browsers immediately through Chrome's built-in update mechanism. Detailed release information is available in the Google Chrome Desktop Update blog post.

Workarounds

• Limit browsing to trusted websites until the patch is applied
• Consider using browser extensions that restrict JavaScript execution on untrusted sites
• Deploy network-level filtering to block known malicious domains
• In enterprise environments, enforce browser update policies through group policy or MDM solutions

# Verify Chrome version on Linux/macOS
google-chrome --version
# Expected output should be 137.0.7151.55 or higher

# Force Chrome update check (user action required in browser)
# Navigate to: chrome://settings/help
# Chrome will automatically check for and apply updates