CVE-2026-13826 Overview
CVE-2026-13826 is an information disclosure vulnerability in the Autofill component of Google Chrome on Android. The flaw affects Chrome versions prior to 150.0.7871.47 and stems from an inappropriate implementation that fails to enforce cross-origin boundaries. A remote attacker who has already compromised the renderer process can leak cross-origin data through a crafted HTML page. Google's Chromium team rated the security severity as High, while the National Vulnerability Database (NVD) assigns a CVSS score of 6.5. The weakness is classified under CWE-346: Origin Validation Error.
Critical Impact
Attackers with renderer compromise can bypass same-origin protections to exfiltrate sensitive cross-origin data, including autofill values, from user browsing sessions on Android devices.
Affected Products
- Google Chrome for Android prior to 150.0.7871.47
- Chromium-based Android browsers sharing the affected Autofill implementation
- Android devices with vulnerable Chrome versions installed
Discovery Timeline
- 2026-06-30 - CVE-2026-13826 published to NVD
- 2026-07-01 - Last updated in NVD database
Technical Details for CVE-2026-13826
Vulnerability Analysis
The vulnerability resides in Chrome's Autofill subsystem on Android. Autofill handles form data such as addresses, payment details, and saved credentials. The component's implementation does not correctly validate the origin context when servicing autofill requests originating from a compromised renderer. An attacker who already controls a renderer process, typically through a chained exploit, can serve a crafted HTML page that triggers autofill logic against a different origin. Because origin checks are inadequate, the response returns data belonging to a cross-origin document. This breaks the same-origin policy that browsers rely on to isolate site data.
The attack targets confidentiality only. Integrity and availability are not affected, and user interaction is required to trigger the malicious page load. The Exploit Prediction Scoring System (EPSS) currently reports a low probability of near-term exploitation for this issue.
Root Cause
The root cause is an origin validation error [CWE-346] in the Autofill implementation. Chrome's Autofill code does not sufficiently verify that the requesting frame and target document share the expected origin before returning field values. This gap allows a malicious renderer to request data from contexts it should not access.
Attack Vector
Exploitation requires two conditions. First, the attacker must already have compromised the Chrome renderer process, typically by chaining a prior renderer bug. Second, the victim must load or interact with a crafted HTML page. Once these conditions are met, the attacker's page issues autofill-related interactions that trigger the vulnerable code path and returns cross-origin data to attacker-controlled JavaScript.
No verified public proof-of-concept code is available for this issue. See the Chromium Issue Tracker Entry and the Google Chrome Stable Update for vendor details.
Detection Methods for CVE-2026-13826
Indicators of Compromise
- Chrome for Android instances running versions below 150.0.7871.47 on managed devices
- Unexpected outbound HTTP POST requests from mobile browsers containing autofill field values such as email addresses, postal addresses, or payment identifiers
- Renderer process crashes or anomalous child process behavior preceding suspicious network traffic
- Access to attacker-controlled domains immediately followed by exfiltration traffic containing form-shaped data
Detection Strategies
- Inventory Chrome versions across Android fleets and flag any endpoint reporting a build older than 150.0.7871.47
- Correlate mobile browser telemetry with DNS and proxy logs to identify sessions visiting untrusted domains that then transmit structured form data
- Hunt for renderer exploitation precursors, since this bug requires a prior renderer compromise to be useful
Monitoring Recommendations
- Ingest mobile device management (MDM) browser version data into your security data lake for continuous version compliance monitoring
- Enable network inspection on egress traffic from managed Android devices where policy permits
- Track Chrome release channel advisories and align patch SLAs to the stable channel cadence
How to Mitigate CVE-2026-13826
Immediate Actions Required
- Update Google Chrome on Android to version 150.0.7871.47 or later through the Google Play Store
- Push the updated Chrome build to managed Android devices using your MDM or Android Enterprise console
- Verify version compliance across the fleet and remediate devices that fail to update automatically
- Review autofill profile contents and remove stored payment or identity data that is not required
Patch Information
Google addressed the issue in the Chrome stable channel update referenced in the Google Chrome Stable Update advisory. The fix is included in Chrome for Android build 150.0.7871.47 and later. Additional developer context is available in the Chromium Issue Tracker Entry.
Workarounds
- Disable Chrome Autofill for addresses, payment methods, and passwords through Chrome settings until the update is applied
- Restrict use of vulnerable Chrome builds on Android through conditional access policies that check browser version
- Advise users to avoid loading untrusted links in Chrome on Android until patched builds are confirmed installed
# Verify Chrome for Android version via ADB on a managed device
adb shell dumpsys package com.android.chrome | grep versionName
# Expected output should show 150.0.7871.47 or later
# versionName=150.0.7871.47
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
