CVE-2026-13937: Google Chrome Information Disclosure Flaw

CVE-2026-13937 Overview

CVE-2026-13937 is an insufficient policy enforcement vulnerability in the Passwords component of Google Chrome. Versions prior to 150.0.7871.47 fail to correctly enforce cross-origin policy boundaries when handling password-related functionality. A remote attacker who has already compromised the renderer process can leak cross-origin data through a crafted HTML page. The Chromium project rates this issue Medium severity. Exploitation requires user interaction, such as visiting a malicious page, and depends on chaining with a separate renderer compromise. The weakness is categorized under [CWE-284: Improper Access Control].

Critical Impact
An attacker with a compromised renderer can bypass same-origin protections in the Passwords component to exfiltrate sensitive cross-origin information from the victim's browser session.

Affected Products

Google Chrome versions prior to 150.0.7871.47
Chromium-based browsers integrating vulnerable Passwords component code
Desktop Stable channel builds on supported operating systems

Discovery Timeline

2026-06-30 - CVE-2026-13937 published to NVD
2026-07-02 - Last updated in NVD database

Technical Details for CVE-2026-13937

Vulnerability Analysis

The flaw resides in Chrome's Passwords subsystem, which manages saved credentials and autofill behavior across web origins. The component does not sufficiently enforce policy checks that isolate password-related data by origin. When an attacker controls the renderer process, they can invoke internal password flows in a way that returns data associated with origins other than the currently framed site. The result is a controlled cross-origin read primitive suitable for stealing tokens, form values, or other sensitive strings rendered in adjacent contexts. User interaction is required, meaning the victim must load attacker-controlled content. The attacker cannot modify data or crash the browser through this specific issue, but the confidentiality impact is significant. Further technical detail is tracked in the Chromium Issue Tracker Entry.

Root Cause

The root cause is missing or incomplete origin checks in the Passwords component's inter-process message handling. Trust decisions that should be enforced in the privileged browser process rely on state that a compromised renderer can influence. This mirrors a broader class of Chromium bugs where policy enforcement is misplaced relative to the sandbox boundary.

Attack Vector

The attack is network-based and requires the victim to load a crafted HTML page. The attacker must first achieve code execution inside the renderer, typically through a separate memory corruption or logic bug. From that position, the attacker sends malformed or unexpected requests to the Passwords component to obtain cross-origin data. No credentials or privileges are required beyond visiting the malicious page.

Exploitation requires a pre-existing renderer compromise chained
with crafted HTML that abuses the Passwords component's policy gap.
No verified proof-of-concept code is publicly available. Refer to
the Chromium Issue Tracker for authoritative technical details.

Detection Methods for CVE-2026-13937

Indicators of Compromise

Chrome browser processes reporting versions earlier than 150.0.7871.47 on managed endpoints.
Unexpected renderer crashes or sandbox escapes preceding suspicious outbound HTTP requests containing form or credential-like strings.
Outbound connections from browser processes to newly registered or low-reputation domains immediately after page navigation.

Detection Strategies

Inventory installed Chrome versions across the fleet and flag any build below 150.0.7871.47.
Correlate browser child-process anomalies with subsequent DNS lookups and TLS connections to identify potential post-exploitation exfiltration.
Alert on password autofill telemetry or DOM interactions that occur on unexpected origins when enterprise password policies are in place.

Monitoring Recommendations

Ingest Chrome enterprise reporting events into the SIEM to track version drift and policy violations.
Monitor endpoint process telemetry for renderer crashes followed by short-lived network egress within the same process tree.
Track deployment status of Chrome updates through configuration management tooling and report exceptions daily.

How to Mitigate CVE-2026-13937

Immediate Actions Required

Update Google Chrome to version 150.0.7871.47 or later on all endpoints through the Stable channel.
Force-restart browser sessions after deployment so the patched binary is loaded into memory.
Audit privileged users and shared workstations first, as they present the highest value for cross-origin data leakage.

Patch Information

Google has released a fix in the Stable channel update announced in the Google Chrome Update Announcement. Administrators should confirm that endpoints have received the 150.0.7871.47 build or later. Chromium-derived browsers should be updated once their vendors publish corresponding releases.

Workarounds

Enforce browser auto-update policies via group policy or MDM so users cannot defer critical Chrome updates.
Restrict use of the built-in password manager on high-risk accounts until patching is verified across the environment.
Apply site isolation and strict same-site cookie policies to reduce the value of any leaked cross-origin data.

bash

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

# Verify installed Chrome version on macOS endpoints
defaults read /Applications/Google\ Chrome.app/Contents/Info CFBundleShortVersionString

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