CVE-2026-13024: Google Chrome Site Isolation Bypass

CVE-2026-13024 Overview

CVE-2026-13024 is an input validation vulnerability in the Navigation component of Google Chrome prior to version 149.0.7827.197. The flaw allows a remote attacker who has already compromised the renderer process to bypass site isolation via a crafted HTML page. Site isolation is a core Chrome security boundary that separates web content from different origins into distinct processes. Bypassing this boundary undermines the browser's defense-in-depth model against cross-origin data theft. The Chromium team rated this issue High severity, while NVD assigned it a Medium CVSS v3.1 score of 4.2. The weakness is categorized as Improper Input Validation [CWE-20].

Critical Impact
An attacker with renderer process compromise can bypass site isolation, defeating a key Chrome security boundary designed to contain cross-origin attacks.

Affected Products

Google Chrome versions prior to 149.0.7827.197
Chromium-based browsers sharing the affected navigation code
Desktop Chrome installations on supported operating systems

Discovery Timeline

2026-06-24 - CVE-2026-13024 published to NVD
2026-06-25 - Last updated in NVD database

Technical Details for CVE-2026-13024

Vulnerability Analysis

The vulnerability resides in Chrome's Navigation logic, where untrusted input is not sufficiently validated during navigation handling. Chrome relies on site isolation to ensure that documents from different sites execute in separate renderer processes. When navigation requests are processed without strict validation, a compromised renderer can manipulate navigation state to escape its assigned site boundary. This is a chained vulnerability that requires prior renderer compromise as a precondition, which raises attack complexity. Once chained, the attacker can access cross-origin content that site isolation is designed to protect, including authenticated session data and rendered DOM content from other origins.

Root Cause

The root cause is improper validation of untrusted input within the Navigation subsystem [CWE-20]. The navigation handler trusts attacker-controlled values supplied through Inter-Process Communication (IPC) from the renderer, allowing the compromised process to influence cross-origin navigation decisions. This breaks the assumption that renderer-supplied data must be treated as adversarial.

Attack Vector

Exploitation requires the attacker to first compromise the renderer process, typically through a separate memory corruption or logic bug. The attacker then serves a crafted HTML page that triggers the malformed navigation sequence. User interaction is required to load the page. Successful exploitation yields a site isolation bypass without further privilege escalation in the host.

No public proof-of-concept code is available. Refer to the Chromium Issue Tracker Entry for additional technical context.

Detection Methods for CVE-2026-13024

Indicators of Compromise

Chrome processes running versions below 149.0.7827.197 in enterprise inventory
Unexpected renderer process crashes preceding cross-origin data exfiltration
Anomalous navigation patterns in browser telemetry, particularly rapid cross-site navigations from a single tab

Detection Strategies

Inventory Chrome installations across endpoints and flag any version below 149.0.7827.197
Correlate browser process telemetry with outbound network connections to attacker-controlled domains
Monitor for delivery of crafted HTML pages via web proxy or email gateway content inspection

Monitoring Recommendations

Enable Chrome enterprise reporting to centralize version and crash telemetry
Ingest endpoint process events into a SIEM or data lake for retrospective hunting against renderer anomalies
Track Chrome stable channel advisories from the Google Chrome Stable Update blog for follow-on fixes

How to Mitigate CVE-2026-13024

Immediate Actions Required

Update Google Chrome to version 149.0.7827.197 or later on all managed endpoints
Force browser restarts through enterprise policy to ensure patched binaries are loaded
Audit Chromium-based browsers in the environment and apply equivalent vendor updates

Patch Information

Google released the fix in Chrome stable channel version 149.0.7827.197. Details are published in the Google Chrome Stable Update announcement. Administrators using Chrome Browser Enterprise should verify update rollout via the admin console.

Workarounds

Restrict browsing to trusted sites using enterprise URL allowlists until patching completes
Deploy web content filtering to block delivery of untrusted HTML from low-reputation domains
Disable or restrict execution of untrusted extensions that could be leveraged in a renderer compromise chain

bash

# Configuration example: enforce minimum Chrome version via Chrome Enterprise policy (Linux)
# /etc/opt/chrome/policies/managed/chrome_version_policy.json
{
  "BrowserSwitcherEnabled": false,
  "RelaunchNotification": 2,
  "RelaunchNotificationPeriod": 86400000,
  "TargetVersionPrefix": "149.0.7827.197"
}