CVE-2025-58485: Samsung Internet XSS Vulnerability

CVE-2025-58485 Overview

CVE-2025-58485 is an improper input validation vulnerability in Samsung Internet browser versions prior to 29.0.0.48. The flaw allows local attackers to inject arbitrary script into the browser context. Samsung addressed the issue in its December 2025 security maintenance release. The vulnerability requires local access and low privileges, with no user interaction needed for exploitation. Successful exploitation impacts integrity through arbitrary script execution but does not directly affect confidentiality or availability.

Critical Impact

Local attackers with low privileges can inject arbitrary script into Samsung Internet, compromising browser session integrity on affected Android devices.

Affected Products

• Samsung Internet versions prior to 29.0.0.48
• Android devices running vulnerable Samsung Internet builds
• Samsung Galaxy devices shipping with default Samsung Internet browser

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

The vulnerability stems from improper input validation in Samsung Internet prior to version 29.0.0.48. The browser fails to properly sanitize or validate input before processing it in a script-capable context. A local attacker with low privileges on the device can craft malicious input that the browser interprets as executable script. This results in arbitrary script injection within the browser process.

The attack vector is local, meaning the attacker must already have some level of access to the device. No user interaction is required. The integrity impact is high because injected scripts can manipulate browser state, modify rendered content, and interact with browser-stored data. Confidentiality and availability are not directly affected per the CVSS vector.

Root Cause

The root cause is missing or insufficient input validation logic within Samsung Internet. The browser accepts attacker-controlled input from a local source and processes it without enforcing strict content boundaries. Samsung has not published the specific component or function affected. The CWE classification is listed as NVD-CWE-noinfo, indicating insufficient public information for a precise weakness mapping.

Attack Vector

An attacker with local access and low privileges supplies crafted input through a vector reachable from another app or local interface. The unsanitized input reaches a script execution context within Samsung Internet. The browser then executes the injected script with the privileges of the browser session. This can be used to alter displayed content, manipulate active sessions, or chain into further attacks against the browser or its stored credentials.

No public proof-of-concept exploit has been released. See the Samsung Security Bulletin December 2025 for vendor-provided technical context.

Detection Methods for CVE-2025-58485

Indicators of Compromise

• Samsung Internet processes spawning unexpected child processes or making anomalous network connections following local app interactions
• Unexpected modifications to Samsung Internet browser data directories or session storage
• Installed Samsung Internet versions below 29.0.0.48 on managed Android devices

Detection Strategies

• Inventory Samsung Internet versions across enrolled mobile devices using mobile device management (MDM) telemetry
• Monitor inter-process communication (IPC) and intent traffic targeting the Samsung Internet package for anomalous payloads
• Correlate suspicious browser activity with recently installed or updated third-party applications that may serve as the local attack source

Monitoring Recommendations

• Enable mobile threat defense logging for Samsung Internet package events and version state
• Track Samsung security bulletin advisories monthly to identify newly disclosed browser vulnerabilities
• Alert on devices remaining on Samsung Internet versions below 29.0.0.48 beyond the patch deployment window

How to Mitigate CVE-2025-58485

Immediate Actions Required

• Update Samsung Internet to version 29.0.0.48 or later through the Galaxy Store or Google Play Store
• Audit managed Android fleet for outdated Samsung Internet installations and enforce update policies via MDM
• Restrict installation of untrusted third-party applications that could provide the local attack surface

Patch Information

Samsung released the fix in Samsung Internet version 29.0.0.48 as part of the December 2025 Samsung Mobile Security Maintenance Release. Refer to the Samsung Security Bulletin December 2025 for the official advisory and update guidance.

Workarounds

• Use an alternative patched browser on affected devices until Samsung Internet can be updated
• Limit the installation of untrusted local applications that could deliver malicious input to the browser
• Apply MDM policies requiring automatic updates for Samsung Internet from official app stores

# Verify installed Samsung Internet version via ADB
adb shell dumpsys package com.sec.android.app.sbrowser | grep versionName

# Expected output should show 29.0.0.48 or later
# versionName=29.0.0.48