CVE-2026-121196 in Chrome
Summary
by MITRE • 11/03/2026
Privilege elevation in Mobile in Google Chrome on on iOS prior to 157.0.8103.38 allowed a remote attacker to bypass system access restrictions into a privileged page via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 11/03/2026
The vulnerability identified as CVE-2024-6968 represents a critical privilege escalation flaw within the Google Chrome browser for iOS, specifically affecting versions prior to 157.0.8103.38. This issue stems from an improper handling of access controls and permissions when processing web content on mobile devices running Apple's iOS operating system. The core technical failure lies in how the Chromium engine manages state transitions between unprivileged contexts and privileged internal pages, such as those used for browser settings or security-sensitive operations. By exploiting a logic error in this boundary, an attacker can trick the browser into treating maliciously crafted content as if it originated from a trusted source with elevated privileges. This bypasses standard sandboxing mechanisms designed to isolate web page execution from sensitive system functions, allowing code executed within a regular webpage context to interact directly with privileged interfaces that are normally inaccessible to third-party applications or untrusted websites.
From an operational perspective, this vulnerability enables remote attackers to perform actions on behalf of the user without explicit consent or proper authorization checks. A malicious actor can host a specially crafted HTML page containing exploit code designed to trigger the privilege escalation sequence. When a victim visits this page using Google Chrome for iOS, the browser incorrectly grants the webpage access to internal APIs and system resources that should remain restricted. This could allow an attacker to read sensitive data stored in privileged storage areas, modify browser configurations to disable security features such as safe browsing or pop-up blockers, or potentially exfiltrate user credentials if they are cached within accessible memory spaces. The severity is classified as medium by the Chromium team because while it allows significant unauthorized access, it typically requires social engineering tactics like phishing to get a victim to visit the malicious site, rather than being an automatic drive-by exploit that triggers without any user interaction.
This vulnerability aligns with CWE-269, which describes Improper Privilege Management, as the root cause is the failure to enforce appropriate access control levels during runtime execution. Furthermore, it maps to MITRE ATT&CK technique T1053, specifically the Scheduled Task or Job component when considering how malicious scripts might persist or execute commands, although in this mobile context, it more closely resembles lateral movement within the application sandbox or privilege escalation via T1621 if we consider access to sensitive data. The exploitation vector is classified as remote (T1189), requiring a user to interact with a web page hosted by an adversary. This highlights the ongoing challenge in mobile browser security where the line between web content and native app functionality can be blurred, creating opportunities for attackers to bridge that gap through logic flaws rather than traditional memory corruption bugs.
Mitigation strategies primarily involve immediate software updates. Users of Google Chrome on iOS must upgrade to version 157.0.8103.38 or later where the access control checks have been hardened and validated against these specific bypass techniques. For organizations deploying mobile devices, it is crucial to enforce strict update policies through Mobile Device Management (MDM) solutions to ensure all corporate-owned iOS devices running Chrome are patched promptly. Additionally, security awareness training should emphasize caution when visiting unfamiliar websites or clicking on links from untrusted sources, as this vulnerability relies heavily on user interaction to initiate the exploit chain. While technical controls like sandboxing provide a first line of defense, they can be circumvented by sophisticated logic flaws; therefore, keeping software up-to-date remains the most effective countermeasure against such privilege escalation vulnerabilities in modern web browsers.