CVE-2026-106250: Google Chrome Auth Bypass Vulnerability

CVE-2026-106250 Overview

CVE-2026-106250 is a missing authorization vulnerability in the Actor component of Google Chrome versions prior to 155.0.8059.39. A remote attacker can leverage social engineering to bypass system access restrictions through a crafted HTML page. The flaw is categorized under CWE-862: Missing Authorization and carries a Chromium security severity rating of Low. Successful exploitation requires user interaction, which limits the scope of unattended attacks. Google addressed the issue in the stable channel update tracked on the Google Chrome Update Blog.

Critical Impact
Attackers can bypass authorization checks in the Chrome Actor component to access restricted system functionality when a user is tricked into visiting a crafted web page.

Affected Products

Google Chrome versions prior to 155.0.8059.39
Chromium-based desktop builds using the vulnerable Actor component
Downstream browsers packaging the pre-patch Chromium release

Discovery Timeline

2026-10-06 - CVE-2026-106250 published to the National Vulnerability Database
2026-10-07 - Last updated in NVD database

Technical Details for CVE-2026-106250

Vulnerability Analysis

The vulnerability resides in the Chrome Actor component, which brokers actions requiring privileged access to browser or system resources. Chrome fails to enforce an authorization check before allowing an operation initiated from web content. An attacker who hosts a crafted HTML page can trigger the Actor code path and perform actions that should be gated by consent or permission policies.

The flaw requires user interaction, consistent with the social engineering vector called out in the advisory. Confidentiality and integrity impact are limited in scope, and availability is not affected. The issue was tracked in the Chromium Issue Tracker Entry.

Root Cause

The root cause is a missing authorization check [CWE-862] in the Actor subsystem. Code paths reachable from renderer-origin content invoke privileged logic without first verifying that the caller holds the required permission. This design gap allows restricted operations to execute when the user is lured into interacting with attacker-controlled content.

Attack Vector

Exploitation is network-based and requires the victim to load a malicious HTML page and perform an interaction such as a click or form submission. The attacker crafts HTML and JavaScript that drive the Actor component into executing a restricted operation. No authentication or prior access to the victim's machine is required.

No public proof-of-concept exploit is available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. See the Chromium Issue Tracker Entry for additional technical context.

Detection Methods for CVE-2026-106250

Indicators of Compromise

Chrome processes loading unexpected HTML pages immediately followed by access to restricted browser APIs or system integrations.
Browser telemetry showing Actor-mediated actions executed without a corresponding permission prompt or user grant.
Outbound connections to newly registered or low-reputation domains delivering HTML lures referencing Chrome-specific features.

Detection Strategies

Inventory endpoint Chrome versions and alert on any build earlier than 155.0.8059.39.
Monitor web proxy and DNS logs for repeated user navigation to domains serving crafted HTML pages tied to phishing campaigns.
Correlate browser process activity with subsequent file, registry, or child-process events that indicate privileged actions originating from web content.

Monitoring Recommendations

Centralize Chrome version data from endpoint management tooling and track remediation progress against the fixed version.
Alert on anomalous child processes spawned by chrome.exe shortly after navigation events.
Enable browser enterprise reporting to capture extension and permission usage anomalies tied to Actor-mediated workflows.

How to Mitigate CVE-2026-106250

Immediate Actions Required

Update Google Chrome to version 155.0.8059.39 or later across all managed endpoints.
Force-restart Chrome after the update to ensure the vulnerable binary is unloaded from memory.
Validate deployment coverage by querying installed versions through endpoint management tooling.

Patch Information

Google released the fix in the stable channel update documented on the Google Chrome Update Blog. Administrators managing Chrome through enterprise policy should push the update via Google Update, Microsoft Intune, Jamf, or equivalent management platforms. Chromium-derivative browsers should be upgraded once their vendors integrate the upstream patch.

Workarounds

Train users to avoid interacting with unsolicited links and unfamiliar HTML attachments while patch rollout completes.
Restrict browsing to approved domains using web filtering or secure web gateway policies where feasible.
Disable or restrict Chrome features that expose the Actor component through enterprise policy until all endpoints are updated.

bash

# Verify installed Chrome version on Windows endpoints
reg query "HKLM\SOFTWARE\WOW6432Node\Google\Update\Clients\{8A69D345-D564-463C-AFF1-A69D9E530F96}" /v pv

# Verify installed Chrome version on macOS endpoints
/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --version