CVE-2026-11202: Chrome iOS Sandbox Escape Vulnerability – CVSS 8.8 High Severity

Technical summary

CVE-2026-11202 stems from an inappropriate implementation in Chrome for iOS' sandbox boundary enforcement. The vulnerability allows a remote attacker to bypass the browser's sandbox isolation via a crafted HTML page, achieving code execution at a privilege level above the browser process. The flaw is classified as CWE-20 (Improper Input Validation), suggesting insufficient validation or sanitization of content that reaches privileged code paths. Despite Chromium's classification of the underlying issue as Medium severity, the CVSS 3.1 score of 8.8 reflects the high impact of successful exploitation: an attacker needs only network access and user interaction (visiting a webpage), with no preconditions, and gains complete compromise of confidentiality, integrity, and availability on the affected device.

Business impact

For organizations managing iOS devices running Chrome—particularly those in regulated industries or with sensitive data on employee devices—this vulnerability poses a direct risk to data confidentiality and device integrity. A compromised iPhone could become a pivot point for lateral movement into corporate networks, especially if the device is used for email, messaging, or VPN access. Attackers could exfiltrate credentials, encryption keys, or proprietary information stored on the device. The low barrier to exploitation (simply visiting a malicious website) increases the likelihood of both targeted and mass-scale attacks. Organizations should treat this as a priority remediation item to prevent supply-chain or employee-device compromises.

Affected systems

The vulnerability affects Google Chrome for iOS on Apple iPhone OS. Specifically, Chrome versions prior to 149.0.7827.53 are vulnerable. Any iPhone or iPad running a vulnerable version of Chrome is at risk. Organizations should inventory Chrome installations across their iOS fleet to determine exposure. Note that this vulnerability is specific to Chrome on iOS; desktop Chrome versions and other iOS browsers are not affected by this particular flaw.

Exploitability

Exploitability is high. An attacker requires only network access and must trick a user into visiting a malicious website; no special credentials, privileges, or software installation is required on the victim's end. The attack surface is broad—any webpage the user visits could potentially host the exploit. The barrier to weaponization is low: an attacker can host the malicious HTML on a compromised website, ad network, or phishing page. There is no evidence of public exploit code, and the vulnerability is not yet listed on CISA's Known Exploited Vulnerabilities (KEV) catalog, but the technical simplicity of the attack suggests that exploitation is likely once details become widely known.

Remediation

Update Google Chrome on all iOS devices to version 149.0.7827.53 or later. For organizations managing devices via Mobile Device Management (MDM) solutions, push the update through your MDM platform to enforce timely patching. For personal devices, users should enable automatic app updates in the iOS App Store settings. Verify that the update has been deployed across your fleet before considering the vulnerability remediated. If immediate updating is not possible, consider restricting Chrome usage on iOS devices or advising users to use alternative browsers (such as Safari) until patches are deployed.

Patch guidance

Patches are available in Chrome 149.0.7827.53 and later. Update through the iOS App Store. Organization-wide updates can be enforced through MDM solutions by setting the minimum allowed Chrome version. IT teams should verify patch deployment via device inventory tools and confirm that all managed iOS devices have upgraded past the affected versions. Test the patch in a pilot group before full rollout to ensure compatibility with internal applications or web-based tools used on iOS.

Detection guidance

Monitor for indicators that devices are running Chrome versions prior to 149.0.7827.53. This can be done through MDM reporting, application inventory tools, or SIEM log collection from managed devices. Additionally, monitor for suspicious process execution or privilege escalation events on iOS devices, though such logs may have limited visibility depending on your MDM solution. Web proxy or firewall logs may reveal visits to known malicious domains hosting exploit payloads, though the specificity of this vulnerability makes signature-based detection difficult. Endpoint detection and response (EDR) tools with iOS support may flag unusual sandbox escape attempts if they have behavioral detection logic for Chrome processes.

Why prioritize this

Despite Chromium's own Medium severity classification, the CVSS 8.8 score, broad attack surface, and ease of exploitation warrant urgent prioritization. Sandbox escapes are among the most dangerous classes of browser vulnerabilities because they can lead to complete device compromise. The requirement for only user interaction and network access—both common in normal browsing—means this vulnerability is likely to be actively exploited once awareness increases. Organizations should treat this as a critical update for any iOS devices with Chrome in their environment, especially if those devices store credentials or have access to sensitive systems.

Risk score, explained

The CVSS 3.1 score of 8.8 (HIGH) reflects a network-exploitable vulnerability requiring only user interaction, with no special privileges or conditions needed. The High impact across all three security dimensions (Confidentiality, Integrity, and Availability) reflects the complete device compromise possible through a successful sandbox escape. The unchanged scope (U) indicates the impact is confined to the affected Chrome process and underlying iOS system, but since the sandbox breach allows privilege escalation, the practical impact extends to all data and functions on the device. The score appropriately prioritizes this as a serious threat despite Chromium's initial Medium designation, which may have underweighted the iOS-specific implications.

Frequently asked questions