CVE-2026-14059 Overview
CVE-2026-14059 is an insufficient policy enforcement vulnerability in the Related-Website-Sets feature of Google Chrome prior to version 150.0.7871.47. The flaw allows a remote attacker to leak cross-origin data through a crafted HTML page. Exploitation requires user interaction, such as visiting a malicious website. The vulnerability is categorized under [CWE-693] Protection Mechanism Failure and affects Chrome installations across Windows, macOS, and Linux.
Critical Impact
A remote attacker can bypass Related-Website-Sets policy enforcement to read cross-origin data from a victim's browser, exposing information that should be isolated between sites.
Affected Products
- Google Chrome versions prior to 150.0.7871.47
- Chrome on Microsoft Windows
- Chrome on Apple macOS and Linux distributions
Discovery Timeline
- 2026-06-30 - CVE-2026-14059 published to NVD
- 2026-07-01 - Last updated in NVD database
Technical Details for CVE-2026-14059
Vulnerability Analysis
The vulnerability resides in Chrome's Related-Website-Sets (RWS) mechanism. RWS allows a group of related domains under common ownership to declare a controlled relationship for limited cross-site cookie access. The feature depends on strict policy checks to prevent unrelated origins from benefiting from these relaxations. Insufficient enforcement of those policy checks in Chrome versions prior to 150.0.7871.47 permits a crafted HTML page to observe data that should remain isolated by the same-origin policy. The result is unauthorized disclosure of cross-origin content to an attacker-controlled page. Google's Chromium team rated the internal security severity as Low, while the NVD scoring reflects the confidentiality impact of cross-origin data exposure.
Root Cause
The root cause is a Protection Mechanism Failure [CWE-693] within the Related-Website-Sets policy evaluation logic. The browser fails to correctly restrict access boundaries defined for participating and non-participating origins. Consequently, the same-origin protections that RWS is designed to relax in a controlled way are relaxed beyond their intended scope.
Attack Vector
Exploitation is network-based and requires user interaction. An attacker hosts a crafted HTML page and lures a Chrome user to visit it. The page issues requests or embeds resources that leverage the flawed RWS enforcement to extract cross-origin data. No authentication or elevated privileges are required from the attacker. The scope remains unchanged, and only confidentiality is affected, per the published CVSS vector.
No public proof-of-concept, exploit code, or CISA KEV listing exists for CVE-2026-14059 at the time of publication. Technical specifics are tracked in the Chromium Issue Tracker Entry.
Detection Methods for CVE-2026-14059
Indicators of Compromise
- Chrome browser processes reporting versions earlier than 150.0.7871.47 in enterprise inventory data.
- Outbound HTTPS requests from user endpoints to newly registered or low-reputation domains hosting HTML content that references multiple unrelated third-party origins.
- Browser telemetry showing anomalous cross-origin resource loads following visits to untrusted sites.
Detection Strategies
- Query endpoint inventory for Chrome installations and flag versions below 150.0.7871.47 for remediation.
- Correlate web proxy logs with threat intelligence feeds to identify user visits to suspicious pages that could host crafted RWS exploitation content.
- Monitor browser update channels and Group Policy state to verify that automatic updates are functioning and Chrome is receiving stable-channel patches.
Monitoring Recommendations
- Track the Google Chrome Desktop Update advisory for follow-on fixes and related disclosures.
- Alert on endpoints where Chrome fails to update within the organization's defined patch window.
- Log and review DNS resolutions to unfamiliar domains that were referenced from pages visited immediately before suspicious cross-origin activity.
How to Mitigate CVE-2026-14059
Immediate Actions Required
- Update Google Chrome to version 150.0.7871.47 or later on all Windows, macOS, and Linux endpoints.
- Enforce automatic Chrome updates through enterprise policy and verify the setting is applied.
- Restart Chrome on all managed endpoints after updates to ensure the patched binary is loaded into memory.
Patch Information
Google addressed CVE-2026-14059 in the Chrome Stable channel release 150.0.7871.47. Details are available in the Google Chrome Desktop Update announcement. Enterprise administrators should deploy the update via Chrome Enterprise, MDM, or the organization's standard software distribution mechanism.
Workarounds
- Restrict browsing to trusted sites through web filtering or DNS-layer controls until patching is complete.
- Educate users to avoid clicking untrusted links, since exploitation requires the victim to visit a crafted page.
- Consider deploying browser isolation for high-risk user groups such as executives and privileged administrators during the patch window.
# Verify Chrome version on Linux/macOS endpoints
google-chrome --version
# Windows: check installed version via registry
reg query "HKLM\SOFTWARE\Google\Chrome\BLBeacon" /v version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
