External risk intelligence

Google Chrome Mojo Sandbox Escape Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.6)

CVE-2026-14109

This vulnerability requires a remote attacker to have already compromised the browser's renderer process and relies on user interaction to process a crafted HTML page. It is a client-side sandbox escape issue within the browser architecture, not an internet-facing service, gateway, or network-accessible management interface.

Google Chrome

before 150.0.7871.47

Halo Surface Signal: 1 out of 5 — much less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A security flaw has been identified in Google Chrome that could allow a remote attacker to escape the browser's security sandbox. This is possible through a specially crafted webpage, though it requires the attacker to have already compromised the browser's internal processes. The potential impact is considered low.

Allows attackers to break out of browser security.
Executive takeaway: Confirm if Chrome is affected.
Focus on confirming relevance and exposure.

Attack Path

How an attacker could exploit the issue

An attacker who has already compromised the renderer process could trick a user into visiting a malicious webpage. This page would contain specially crafted HTML designed to exploit a weakness in how policies are enforced within the Mojo system. Successfully triggering this vulnerability could allow the attacker to break out of the browser's sandbox, potentially leading to broader system compromise.

Requires renderer process compromise.
Triggered by a crafted HTML page.
Risk of sandbox escape.

Live Threat

Current exploitation, exposure, and threat context

A remote attacker who has already compromised the browser's renderer process could exploit this vulnerability by tricking a user into visiting a malicious HTML page. This could potentially lead to a sandbox escape, affecting the integrity and confidentiality of the user's session within the browser.

Renderer process integrity.
Crafted HTML page via user interaction.
Sandbox escape could affect session.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability impacts Google Chrome's Mojo component, specifically concerning sandbox escape through a crafted HTML page. The first practical step is for the platform or infrastructure teams to identify all Chrome instances within their environment, confirm if they are internet-facing or accessible to compromised renderer processes, and then engage with the browser owners or security teams to prioritize and plan remediation.

Platform or browser owners should lead.
Verify Chrome instances and exposure.
Plan remediation, consider vendor coordination.

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 Mojo component in Google Chrome?

Mojo is a collection of runtime libraries in Google Chrome that facilitates communication between different processes. It acts as an internal messaging system, allowing separate parts of the browser—like the renderer that processes web content and the core browser process—to securely exchange data and requests while maintaining isolation.

What does CWE-602 mean for CVE-2026-14109?

CWE-602 refers to 'Insufficient Policy Enforcement.' In the context of this vulnerability, it means the Mojo system fails to properly verify or restrict certain actions. Because of this flaw, the browser's security boundaries can be bypassed, potentially allowing an attacker to escape the sandbox that normally traps and isolates web content from the underlying system.

How is this sandbox escape triggered?

Triggering this vulnerability requires two specific conditions: an attacker must have already successfully compromised the browser's renderer process, and the user must be tricked into visiting a malicious webpage containing crafted HTML. Simply browsing the web normally or encountering a standard malicious site without a prior renderer compromise does not trigger this flaw.

Is my system at high risk according to Halo Surface Signal?

Halo Surface Signal classifies this risk as very unlikely. This is because the vulnerability is not a direct, internet-facing service flaw but a client-side issue. It relies on a multi-stage attack starting with a renderer compromise and requires specific user interaction, making it less accessible to remote attackers compared to exposed network services.

What should I do if I am running Google Chrome?

The primary step is to identify all Chrome instances within your environment and confirm their current version. Since this is a browser-based vulnerability, coordination with browser owners is key. You should prioritize updating to version 150.0.7871.47 or later, which contains the necessary security updates to address the insufficient policy enforcement in Mojo.

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.