External risk intelligence

Apple WebContent Sandbox Escape Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 10.0)

CVE-2026-112690

The vulnerability involves breaking out of the WebContent sandbox in Apple operating systems. While these platforms are widely used, sandbox escapes typically require the user to interact with malicious web content, meaning the attack surface is exposed via web browsing rather than being a directly internet-facing service or appliance.

Apple Ipados

before 26.7.227.0 to before 27.215.0 to before 15.8.226.0 to before 26.7.2before 27.2

Halo Surface Signal: 3 out of 5 — possibly public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This critical vulnerability in Apple operating systems allows remote attackers to break out of a protected environment, potentially leading to significant compromise. The issue is present in various versions of iOS, iPadOS, macOS, and visionOS, and has been addressed through software updates.

Attackers can escape system sandboxes.
Affects widely used Apple devices and systems.
Confirm relevance and ensure systems are updated.

Attack Path

How an attacker could exploit the issue

An attacker can reach this vulnerability by sending specially crafted web content to a user's device. This content can cause an issue within the WebContent sandbox, potentially allowing the attacker to escape this restricted environment. Successful exploitation could lead to significant compromise of the affected system.

Entry condition: Network access, no privileges needed.
Trigger point: Loading malicious web content.
Resulting risk: Break out of sandbox, compromise device.

Live Threat

Current exploitation, exposure, and threat context

A remote attacker could potentially escape the WebContent sandbox on affected Apple operating systems, which might allow for unauthorized access to system resources or data when a user interacts with specially crafted web content.

System data and user data could be affected.
Exposure may occur through malicious web content.
Unauthorized access to system resources is possible.

Operational Fix

Recommended remediation, mitigation, and detection steps

This critical vulnerability impacts Apple's iOS, iPadOS, macOS, and visionOS, potentially allowing remote attackers to break out of the WebContent sandbox. Responsibility for addressing this likely falls to device owners and IT/security teams managing these Apple endpoints. The first practical step is to identify all affected devices, confirm their reachability and business criticality, and then prioritize remediation based on potential exposure.

Device owners and IT/security teams should lead remediation.
Verify all affected Apple devices are inventoried.
Plan for phased updates during maintenance windows.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is the WebContent component in Apple devices?

The WebContent component is the engine that powers web browsing across Apple's ecosystem, including iOS, iPadOS, macOS, and visionOS. It acts as a protective container, or sandbox, designed to isolate web-based tasks from the rest of your system's data and resources. By separating browser activity from core system functions, this component helps ensure that websites you visit cannot access unauthorized areas of your device.

How does CVE-2026-112690 allow a sandbox escape?

This vulnerability is an input validation error. When a system fails to properly check the data it receives, an attacker can supply malicious web content designed to overwhelm or bypass the rules of the WebContent sandbox. By breaking out of this restricted environment, the attacker gains the ability to interact with the underlying system in ways the sandbox was specifically designed to prevent.

Do I need to do anything to trigger this vulnerability?

This issue is triggered when a device processes specially crafted web content. You do not need to provide any credentials or elevated permissions for this to occur. Importantly, simply having an affected device powered on does not trigger the bug; the system must encounter the malicious content, typically through web browsing, for the sandbox protections to be compromised.

Is my device at risk based on Halo Surface Signal?

Halo Surface Signal indicates that because this vulnerability targets the WebContent sandbox, your risk is primarily driven by web interaction rather than public-facing services. While Apple devices are widely used, this is not a service that is constantly exposed to the open internet. Instead, your exposure depends on browsing habits and the content you encounter while using your device.

What is the first step to remediate CVE-2026-112690?

The most effective way to address this issue is to update your Apple devices to the latest software versions. First, inventory your systems to identify those running older versions of iOS, iPadOS, macOS, or visionOS that fall under the affected criteria. Once identified, prioritize these devices for updates during your next maintenance window to ensure they have the improved input validation provided by Apple's latest patches.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.