CVE-2026-13813: iOS Chrome Sandbox Escape Vulnerability – High Severity Patch

Technical summary

CVE-2026-13813 stems from insufficient policy enforcement in Chrome for iOS's sandbox architecture. An attacker with prior renderer process compromise can exploit improper input validation (CWE-20) through a crafted HTML page to achieve sandbox escape on affected iOS devices. The vulnerability requires a compromised renderer context and user interaction (visiting a malicious page), but once exploited, allows full system-level access beyond browser boundaries. Chromium classifies this as high severity.

Business impact

A successful sandbox escape on an iOS device running vulnerable Chrome could allow an attacker to access sensitive user data stored on the phone, intercept communications, install persistent malware, or pivot to other applications and system services. For organizations using iOS as a primary mobile platform, this represents a pathway from web-based compromise to full device compromise. The attack chain requires prior renderer compromise, which typically happens when users visit a malicious website, making this a realistic threat in enterprise environments where employees browse untrusted content.

Affected systems

Google Chrome for iOS versions prior to 150.0.7871.47 are affected. Users on Apple iOS devices (all versions compatible with the affected Chrome builds) are at risk. Desktop Chrome is not affected by this specific vulnerability—this is iOS-only. The vulnerability does not affect Chrome on Android or other platforms.

Exploitability

Exploitation requires two conditions: (1) the attacker must first compromise Chrome's renderer process—typically by delivering malicious JavaScript or WebAssembly code through a crafted webpage—and (2) the user must interact with the malicious page. While these conditions limit broad opportunistic attacks, they are achievable in targeted campaigns. The High CVSS score (8.3) reflects the severity of the impact (complete system compromise) once both conditions are met, though the attack complexity and user interaction requirements prevent trivial widespread exploitation.

Remediation

Update Google Chrome for iOS to version 150.0.7871.47 or later. This patch enforces stricter policy validation in the iOS sandbox implementation, closing the escape vector. Users should enable automatic app updates in iOS App Store settings to receive patches promptly. No workarounds exist; patching is the only mitigation.

Patch guidance

Verify that your iOS devices are running Google Chrome version 150.0.7871.47 or higher by opening Chrome, tapping the menu icon, selecting 'Settings,' and checking 'About Google Chrome.' iOS will automatically offer an update if a newer version is available. Enterprise administrators should use Mobile Device Management (MDM) policies to enforce minimum Chrome versions on corporate iOS devices. Test the update on a representative device before broad deployment to ensure compatibility with your organization's workflows.

Detection guidance

Monitor for unusual sandbox behavior or privilege escalation attempts on iOS devices, though detection is challenging since the vulnerability operates within the browser boundary. At the network level, consider blocking known malicious domains that host exploit pages. In enterprise environments, review MDM logs to identify devices still running Chrome versions prior to 150.0.7871.47. Endpoint detection tools on jailbroken iOS devices may flag suspicious system calls, but standard iOS devices offer limited post-exploitation visibility. Focus detection efforts on prevention (keeping Chrome current) rather than post-breach analysis.

Why prioritize this

Although CVE-2026-13813 is not on CISA's Known Exploited Vulnerabilities list, its High severity rating and complete sandbox escape capability make it a priority for rapid patching. The iOS mobile platform's integration with sensitive business workflows (email, calendar, authentication) elevates risk. Organizations should prioritize this patch in their mobile app update schedules, treating it similarly to critical OS-level vulnerabilities. The two-stage attack requirement (renderer compromise + sandbox escape) means patching eliminates the second stage, even if initial compromise occurs.

Risk score, explained

The CVSS 8.3 (High) score reflects a network-based attack vector with the potential for complete confidentiality, integrity, and availability impact. The High severity is justified: once the sandbox is escaped, the attacker has unrestricted access to the iOS device. However, the score is tempered (not Critical) by the requirement for prior renderer compromise and user interaction, which reduce the probability of automated large-scale exploitation. For your risk assessment, treat this as High priority but acknowledge that your exposure depends on (a) user browsing habits and (b) the prevalence of renderer-exploiting attacks in your threat landscape.

Frequently asked questions