CVE-2025-58485: Samsung Internet XSS Vulnerability

CVE-2025-58485 Overview

CVE-2025-58485 is an improper input validation vulnerability affecting Samsung Internet browser versions prior to 29.0.0.48. This vulnerability allows local attackers to inject arbitrary scripts into the browser context, potentially leading to manipulation of web content, theft of sensitive data, or execution of malicious code within the browser's security context.

Critical Impact

Local attackers can exploit improper input validation to inject arbitrary scripts, compromising the integrity of web sessions and potentially accessing sensitive user data processed by the browser.

Affected Products

• Samsung Internet versions prior to 29.0.0.48

Discovery Timeline

• 2025-12-02 - CVE-2025-58485 published to NVD
• 2025-12-03 - Last updated in NVD database

Technical Details for CVE-2025-58485

Vulnerability Analysis

This vulnerability is classified as an Improper Input Validation issue (Script Injection) with a CVSS v3.1 score of 5.5 (Medium). The complete CVSS vector is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N, indicating:

• Attack Vector (AV:L): Local access is required to exploit this vulnerability
• Attack Complexity (AC:L): Low complexity - exploitation is straightforward once local access is obtained
• Privileges Required (PR:L): Low privileges are needed to execute the attack
• User Interaction (UI:N): No user interaction is required for exploitation
• Scope (S:U): The vulnerability's impact is contained within the vulnerable component
• Confidentiality Impact (C:N): No direct impact on confidentiality
• Integrity Impact (I:H): High impact on integrity - attackers can modify data
• Availability Impact (A:N): No impact on availability

The EPSS (Exploit Prediction Scoring System) probability is 0.021% with a percentile of 4.817 as of 2025-12-16, indicating a relatively low probability of exploitation in the wild.

Root Cause

The root cause of CVE-2025-58485 stems from insufficient input validation within Samsung Internet browser. The browser fails to properly sanitize or validate input data before processing, allowing malicious actors with local access to craft inputs that inject arbitrary scripts. This type of vulnerability typically occurs when user-controllable data is incorporated into executable contexts without adequate validation or encoding.

Attack Vector

The attack requires local access to the device running Samsung Internet browser. An attacker with low-level privileges on the device can exploit this vulnerability by:

1. Crafting malicious input that bypasses the browser's input validation mechanisms
2. Injecting arbitrary script content that executes within the browser's context
3. Leveraging the injected script to manipulate web content or access data processed by the browser

The vulnerability specifically impacts data integrity, as the injected scripts can modify web content and browser behavior without the user's knowledge or consent. While this requires local access, it presents significant risk in scenarios involving shared devices, compromised applications, or malicious software already present on the system.

Detection Methods for CVE-2025-58485

Indicators of Compromise

• Unusual script execution patterns within Samsung Internet browser processes
• Unexpected modifications to web page content or browser behavior
• Suspicious local processes interacting with Samsung Internet browser components
• Anomalous inter-process communication involving the browser

Detection Strategies

Organizations can implement the following detection strategies:

1. Version Monitoring: Inventory all devices running Samsung Internet and identify those running versions prior to 29.0.0.48
2. Behavioral Analysis: Monitor for unusual script injection patterns or unexpected browser behavior on managed devices
3. Application Logging: Enable enhanced logging for Samsung Internet browser to capture input validation events and potential exploitation attempts
4. Endpoint Detection: Deploy endpoint detection solutions capable of identifying script injection attacks targeting mobile browsers

Monitoring Recommendations

Security teams should implement continuous monitoring for:

• Samsung Internet browser version compliance across managed device fleets
• Unusual local process activity targeting browser components
• Script injection attempts through application sandboxing and runtime protection mechanisms
• Mobile Device Management (MDM) alerts related to browser integrity

SentinelOne Singularity provides comprehensive endpoint protection that can detect and prevent script injection attacks through behavioral AI analysis and real-time process monitoring on mobile and desktop platforms.

How to Mitigate CVE-2025-58485

Immediate Actions Required

• Update Samsung Internet browser to version 29.0.0.48 or later immediately
• Review device access controls to minimize local attack surface
• Implement Mobile Device Management (MDM) policies to enforce browser version compliance
• Monitor for signs of exploitation on devices running vulnerable versions

Patch Information

Samsung has released a security update addressing this vulnerability. The patch is available in Samsung Internet version 29.0.0.48 and later. Users should update through their device's application store (Google Play Store or Galaxy Store).

For detailed patch information, consult Samsung's official security advisory: https://security.samsungmobile.com/serviceWeb.smsb?year=2025&month=12

Workarounds

If immediate patching is not possible, consider the following temporary mitigations:

1. Restrict Device Access: Limit local access to devices running vulnerable Samsung Internet versions to trusted users only
2. Use Alternative Browsers: Consider using an alternative mobile browser until the update can be applied
3. Enhanced Monitoring: Implement additional monitoring on affected devices to detect potential exploitation attempts
4. Application Sandboxing: Ensure proper application isolation and sandboxing is enabled on affected devices

Organizations using SentinelOne can leverage the Singularity platform's mobile threat defense capabilities to provide an additional layer of protection against script injection attacks while patches are being deployed across the fleet.