CVE-2026-15125: Google Chrome Forms RCE Vulnerability

CVE-2026-15125 Overview

CVE-2026-15125 is a high-severity vulnerability in the Forms component of Google Chrome prior to version 150.0.7871.115. The flaw stems from an inappropriate implementation classified under [CWE-863: Incorrect Authorization]. A remote attacker can execute arbitrary code inside the Chrome sandbox by convincing a user to visit a crafted HTML page. Google's Chromium team rated the security severity as High, and the issue was addressed in the Chrome Stable Channel update. Exploitation requires user interaction, but no privileges or authentication are needed to trigger the flaw.

Critical Impact
Successful exploitation allows arbitrary code execution within the Chrome sandbox process, compromising confidentiality, integrity, and availability of browser session data through a single crafted web page visit.

Affected Products

Google Chrome Desktop versions prior to 150.0.7871.115
Chromium-based browsers incorporating the vulnerable Forms implementation
All operating systems supported by Chrome Stable Channel (Windows, macOS, Linux)

Discovery Timeline

2026-07-08 - CVE-2026-15125 published to NVD
2026-07-09 - Last updated in NVD database

Technical Details for CVE-2026-15125

Vulnerability Analysis

The vulnerability resides in the Forms subsystem of Chrome's rendering engine. An inappropriate implementation permits a crafted HTML page to bypass expected authorization checks and execute arbitrary code within the sandboxed renderer process. The attack occurs entirely over the network and requires only that a user load an attacker-controlled page.

While Chrome's sandbox contains the initial code execution, adversaries commonly chain sandboxed renderer bugs with separate sandbox escape vulnerabilities to achieve full system compromise. The Exploit Prediction Scoring System (EPSS) currently rates the probability of near-term exploitation at a moderate level relative to other web-facing vulnerabilities.

Root Cause

The root cause is an inappropriate implementation [CWE-863] in the Forms handling logic. Authorization or state validation within form processing does not correctly enforce expected boundaries, enabling attacker-controlled content in an HTML page to trigger unintended code paths inside the renderer.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker hosts a crafted HTML page containing malicious form markup or scripting. When a victim visits the page, the Forms component processes the attacker-controlled input and executes arbitrary code within the Chrome sandbox. Delivery mechanisms include phishing links, malicious advertisements, and compromised legitimate websites.

For technical details, refer to the Chromium Issue #523737685 and the Chrome Stable Channel Update.

Detection Methods for CVE-2026-15125

Indicators of Compromise

Unexpected child processes spawned from chrome.exe or the Chrome renderer following browsing sessions
Outbound network connections from renderer processes to unfamiliar domains or IP addresses
Chrome renderer crashes correlated with visits to untrusted or newly registered domains
Browser telemetry indicating installed Chrome versions below 150.0.7871.115

Detection Strategies

Inventory Chrome installations across the environment and flag any endpoints running versions earlier than 150.0.7871.115
Monitor endpoint process trees for anomalous renderer behavior, such as script interpreters or shell processes launched by Chrome
Correlate web proxy logs with threat intelligence feeds to identify user visits to domains hosting known exploit pages

Monitoring Recommendations

Enable browser version reporting through enterprise management tooling to track patch adoption
Log DNS and HTTP requests originating from browser processes for retrospective analysis
Alert on Chrome crash dumps referencing the Forms component, which may indicate exploitation attempts

How to Mitigate CVE-2026-15125

Immediate Actions Required

Update Google Chrome to version 150.0.7871.115 or later on all managed endpoints without delay
Force-restart Chrome after deployment to ensure the patched binary is loaded into memory
Verify update status across the fleet using enterprise browser management or endpoint inventory tools
Instruct users to avoid clicking untrusted links until the patched version is confirmed installed

Patch Information

Google released the fix in the Chrome Stable Channel update at version 150.0.7871.115. Administrators should reference the Chrome Stable Channel Update advisory for full release notes and rollout guidance. Chromium-based browsers should apply their vendor's corresponding patched release.

Workarounds

Restrict browsing to trusted domains via web filtering or DNS-based controls until patching completes
Deploy enterprise policies that disable or restrict form auto-fill and script execution on untrusted origins
Isolate high-risk browsing activity through remote browser isolation or dedicated virtual machines

bash

# Verify Chrome version on Linux endpoints
google-chrome --version

# Force update via Chrome enterprise policy (Windows)
reg add "HKLM\SOFTWARE\Policies\Google\Update" /v UpdateDefault /t REG_DWORD /d 1 /f