CVE-2026-11271 Overview
CVE-2026-11271 is an information disclosure vulnerability in the Passwords component of Google Chrome prior to version 149.0.7827.53. The flaw stems from an inappropriate implementation that allows a remote attacker to leak cross-origin data when a victim performs specific user interface gestures on a crafted HTML page. Chromium classifies the security severity as Low, while the CVSS score reflects the confidentiality impact of cross-origin data exposure. The vulnerability is tracked under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Critical Impact
A remote attacker can extract cross-origin data, including potentially sensitive information tied to the Passwords feature, by tricking a user into performing specific UI gestures on a malicious page.
Affected Products
- Google Chrome prior to 149.0.7827.53 on Microsoft Windows
- Google Chrome prior to 149.0.7827.53 on Apple macOS
- Google Chrome prior to 149.0.7827.53 on Linux
Discovery Timeline
- 2026-06-05 - CVE-2026-11271 published to NVD
- 2026-06-08 - Last updated in NVD database
Technical Details for CVE-2026-11271
Vulnerability Analysis
The vulnerability resides in the Passwords feature within Google Chrome. An inappropriate implementation permits cross-origin data to be observed by an attacker-controlled origin when the user performs specific UI gestures. Because the same-origin policy is the primary boundary protecting user data between websites, any leakage of cross-origin content represents a meaningful confidentiality issue.
Exploitation requires user interaction, which raises the practical bar for abuse. However, the gestures involved (such as clicks or form interactions) are common enough that a well-crafted page could plausibly induce them. The vulnerability does not require authentication, and it can be delivered over the network through a standard web page load.
No public proof-of-concept is available, and the issue is not listed in the CISA Known Exploited Vulnerabilities catalog. The EPSS probability is low, consistent with the user-interaction requirement and the absence of disclosed exploit code.
Root Cause
The root cause is an implementation defect in how the Passwords feature handles data isolation across origins. Under specific user-driven conditions, internal state or rendered content tied to one origin becomes observable to another, violating the cross-origin protections that Chromium normally enforces.
Attack Vector
An attacker hosts a crafted HTML page and lures a victim to visit it. The page is designed to coax the user into performing specific UI gestures. Once those gestures occur, the page can read or infer cross-origin data that would otherwise be inaccessible. Refer to the Chromium Issue Tracker entry for upstream details once access restrictions are lifted.
No verified exploit code is published. The vulnerability is described in prose only, in line with Chromium's standard disclosure practice of withholding implementation specifics until a majority of users have updated.
Detection Methods for CVE-2026-11271
Indicators of Compromise
- Browser telemetry showing Chrome versions earlier than 149.0.7827.53 accessing untrusted external sites.
- Web proxy or DNS logs recording user visits to newly registered or low-reputation domains hosting interactive forms or password prompts.
- Endpoint records of credential autofill events occurring on unexpected origins shortly after navigation to suspicious pages.
Detection Strategies
- Inventory installed Chrome versions across managed endpoints and flag any build below 149.0.7827.53.
- Inspect browser update channels and group policy configurations to confirm stable-channel updates are being applied.
- Correlate web gateway logs with endpoint browsing history to identify users who visited untrusted pages while running vulnerable Chrome builds.
Monitoring Recommendations
- Track Chrome version distribution continuously and alert when outdated builds remain after the patch window.
- Monitor for anomalous interactions with password autofill, including unexpected cross-origin form submissions.
- Use threat intelligence feeds to block known malicious domains that may serve crafted HTML targeting browser UI flaws.
How to Mitigate CVE-2026-11271
Immediate Actions Required
- Update Google Chrome to version 149.0.7827.53 or later on Windows, macOS, and Linux endpoints.
- Force-restart browser sessions after deployment so the patched binary is loaded on all managed devices.
- Verify enterprise auto-update policies are enabled and not blocked by network or endpoint configurations.
Patch Information
Google released the fix in the Stable channel update documented in the Google Chrome Desktop Update advisory. Administrators using Chrome Browser Cloud Management or group policy should validate that managed devices have rolled forward to 149.0.7827.53 or a later release.
Workarounds
- Restrict browsing to trusted sites through web filtering until all endpoints are patched.
- Disable or reduce reliance on the Chrome password manager temporarily for high-risk users handling sensitive accounts.
- Educate users to avoid interacting with unfamiliar UI prompts, particularly password-related dialogs on untrusted pages.
# Verify installed Chrome version on Linux endpoints
google-chrome --version
# Windows registry check for enforced auto-update (run as admin)
reg query "HKLM\SOFTWARE\Policies\Google\Update" /v UpdateDefault
# macOS version check
/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
