CVE-2025-67316: Realme Browser RCE Vulnerability

CVE-2025-67316 Overview

CVE-2025-67316 is a Cross-Site Scripting (XSS) vulnerability affecting the realme Internet browser version 45.13.4.1. This vulnerability allows a remote attacker to execute arbitrary code via a crafted webpage in the built-in HeyTap/ColorOS browser. The flaw stems from improper input validation (CWE-79), enabling attackers to inject malicious scripts through specially crafted web content.

Critical Impact

Remote attackers can execute arbitrary code through crafted webpages, potentially compromising user sessions, stealing sensitive data, or performing actions on behalf of authenticated users within the browser context.

Affected Products

• realme Internet browser v.45.13.4.1
• HeyTap/ColorOS built-in browser

Discovery Timeline

• 2026-01-05 - CVE CVE-2025-67316 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2025-67316

Vulnerability Analysis

This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting (XSS). The realme Internet browser fails to properly sanitize or validate input when processing web page content, allowing attackers to inject malicious scripts that execute within the browser's context.

The vulnerability requires user interaction where the victim must visit a specially crafted webpage. Once triggered, the attacker can potentially access sensitive information within the browser context, manipulate the DOM, steal session tokens, or redirect users to malicious sites. The impact is limited to confidentiality and integrity breaches without direct availability impact.

Root Cause

The root cause of this vulnerability lies in inadequate input validation and output encoding within the HeyTap/ColorOS browser's web rendering engine. When processing webpage content, the browser fails to properly sanitize user-controllable input, allowing JavaScript code injection through malicious web content. This is a classic XSS vulnerability pattern where untrusted data is included in dynamic web content without appropriate sanitization.

Attack Vector

The attack vector is network-based, requiring the attacker to host or inject malicious content on a webpage that the victim visits. The attack flow typically involves:

1. Attacker creates a webpage containing malicious JavaScript payload
2. Victim using realme Internet browser v.45.13.4.1 navigates to the malicious page
3. The browser fails to sanitize the malicious input and renders the script
4. Malicious JavaScript executes within the browser context with access to the user's session data

The vulnerability exploits the browser's failure to properly escape or filter malicious input embedded in webpage content. Technical details about the specific exploitation method can be found in the GitHub Gist documentation referenced in the security disclosure.

Detection Methods for CVE-2025-67316

Indicators of Compromise

• Unusual JavaScript execution patterns in browser logs from visited webpages
• Unexpected network requests to unknown domains originating from the browser
• User reports of strange browser behavior or unauthorized actions after visiting specific websites
• Evidence of session token exfiltration or cookie theft attempts

Detection Strategies

• Monitor browser version information to identify devices running the vulnerable v.45.13.4.1 version
• Implement web content filtering to detect and block known malicious XSS payloads
• Deploy network traffic analysis to identify suspicious outbound connections from mobile devices
• Use endpoint detection solutions to monitor for script injection attempts and suspicious browser activity

Monitoring Recommendations

• Enable verbose logging on network perimeter devices to capture potential XSS attack patterns
• Implement behavioral analysis on mobile devices to detect anomalous browser activity
• Configure alerts for known malicious domain access from corporate mobile devices
• Review web proxy logs for requests containing encoded script injection patterns

How to Mitigate CVE-2025-67316

Immediate Actions Required

• Update the realme Internet browser to the latest available version that addresses this vulnerability
• Advise users to avoid visiting untrusted websites until the browser is updated
• Consider using an alternative browser application until a patch is confirmed available
• Implement network-level content security policies to filter potential XSS payloads

Patch Information

Users should check the Realme Security Portal for official security updates and patch availability. Ensure automatic updates are enabled for the realme Internet browser and ColorOS system components. Monitor official realme channels for security advisories addressing this vulnerability.

Workarounds

• Disable JavaScript execution in the browser settings if feasible for critical browsing activities
• Use a third-party browser application as an alternative until an official patch is released
• Implement Content Security Policy (CSP) headers on organization-controlled websites to limit script execution
• Deploy mobile device management (MDM) solutions to restrict access to untrusted web content