External risk intelligence

Apple Safari Web Content Sandbox Escape

CVE advisorySeverity: CRITICAL (CVSS 10.0)

CVE-2026-113897

The vulnerability affects Web Content processing in web browsers and operating system frameworks. Because web browsers are designed to interpret untrusted content from the public internet by default, the attack surface is considered highly exposed as a standard deployment pattern for internet-facing client software.

Apple Safari

before 27.227.0 to before 27.2

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability has been identified in Apple's Safari browser and operating system frameworks, potentially allowing unauthorized access and control over affected systems. This issue has been addressed through code removal in recent updates for Safari, iOS, iPadOS, macOS, and visionOS.

Attackers could escape browser security boundaries.
Critical access issue impacting Apple platforms.
Confirm relevance and exposure across affected devices.

Attack Path

How an attacker could exploit the issue

An attacker could leverage this vulnerability by sending a specially crafted web page to a user, which, when viewed in a vulnerable browser, could allow them to escape the browser's security sandbox. This could potentially lead to broader system compromise by enabling access to sensitive information or further malicious actions on the user's device.

No special access needed.
Viewing a malicious web page.
Break out of sandbox, gain access.

Live Threat

Current exploitation, exposure, and threat context

A remote attacker may be able to break out of the Web Content sandbox, potentially impacting system integrity and data confidentiality on affected devices when they interact with malicious web content.

System integrity and data confidentiality.
Attacker breaks out of sandbox.
Unspecified system compromise.

Operational Fix

Recommended remediation, mitigation, and detection steps

The primary responsibility for addressing this vulnerability lies with the teams managing Apple operating systems and Safari browsers, including platform, infrastructure, and potentially endpoint security teams. The immediate practical step is to identify all systems running affected versions of macOS, iOS, iPadOS, visionOS, or Safari, determine their exposure to the internet or untrusted inputs, and then establish ownership for remediation planning and execution.

Own by platform and endpoint teams.
Verify affected device and browser versions.
Plan and coordinate timely updates.

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 Safari and the related Apple software affected by CVE-2026-113897?

Safari is Apple's web browser, used across their ecosystem to render internet content. The affected software includes the core browser engine and integrated OS frameworks found in iOS, iPadOS, macOS, and visionOS. These components work together to display web pages safely. Because these frameworks are deeply embedded in Apple devices to handle web data, the vulnerability impacts a wide range of hardware, from mobile phones and tablets to desktop computers and spatial computing headsets.

How does this sandbox escape work in simple terms?

A sandbox is a security control that confines web content to a restricted area, preventing it from interacting with your files or system settings. CVE-2026-113897 describes a flaw where an attacker can break through these walls. Essentially, it turns a restricted web browsing process into one that can bypass intended security boundaries, potentially allowing the attacker to perform actions outside the browser's designated space.

Do I need to do something specific to trigger this vulnerability?

Triggering this flaw does not require special administrative access or complex setup. The primary path is simply viewing a specially crafted web page in a vulnerable browser version. Importantly, the vulnerability is not triggered by standard, safe web browsing; it specifically requires interaction with malicious content designed to exploit the sandbox defect. If you avoid untrusted links or compromised sites, you limit the opportunity for this specific bug to be engaged.

Why is this CVE considered highly relevant according to Halo Surface Signal?

Halo Surface Signal identifies this as highly relevant because browsers are built to process untrusted content from the public internet. Since these devices are standardly used to navigate the open web, they are inherently exposed to external threats. Because this software is designed to interact with external sources by default, it does not require an attacker to breach an internal network to initiate the attack; the risk follows the device wherever it accesses the web.

What should I do if I am running affected Apple software?

Your first step is to verify the software version on all your Apple devices, including macOS, iOS, iPadOS, and visionOS. Check your system settings to confirm if you are running version 27.2 or later, as the vulnerability is fixed in those releases. Coordinate with your IT or device management team to ensure these updates are applied promptly across your fleet to close the security gap created by the removed code.

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.