CVE-2026-11254: Google Chrome XSS Vulnerability

CVE-2026-11254 Overview

CVE-2026-11254 is a user interface spoofing vulnerability in the Permissions component of Google Chrome prior to version 149.0.7827.53. A remote attacker can exploit the flaw by serving a crafted HTML page that manipulates how permission prompts are rendered. The issue is classified under [CWE-451: User Interface (UI) Misrepresentation of Critical Information]. Chromium's internal security team rated the severity as Low. The vulnerability requires user interaction and affects Chrome on Windows, macOS, and Linux desktop platforms.

Critical Impact
A remote attacker can deceive users into granting site permissions or trusting malicious content by spoofing legitimate Chrome UI elements through a crafted HTML page.

Affected Products

Google Chrome prior to 149.0.7827.53
Microsoft Windows desktop installations of Chrome
Apple macOS and Linux desktop installations of Chrome

Discovery Timeline

2026-06-05 - CVE-2026-11254 published to NVD
2026-06-05 - Last updated in NVD database

Technical Details for CVE-2026-11254

Vulnerability Analysis

The vulnerability resides in the Permissions subsystem of Chrome, which manages prompts for capabilities such as camera, microphone, geolocation, notifications, and clipboard access. An inappropriate implementation allows a crafted HTML page to misrepresent permission-related UI to the user. Because the spoofed elements appear authentic, victims cannot easily distinguish attacker-controlled content from browser chrome.

Exploitation requires the victim to load a malicious page and interact with it. The attack does not yield code execution or direct data theft. Instead, it enables social engineering by tricking users into approving requests they would otherwise deny. The integrity impact is limited, and confidentiality and availability remain unaffected.

Root Cause

The root cause is improper handling of permission UI rendering, mapped to [CWE-451]. Chrome's permission dialog logic fails to fully isolate trusted browser UI from page-controlled content. A crafted page can overlay, time, or position elements so that user clicks or visual cues align with attacker objectives rather than the user's intent.

Attack Vector

The attack vector is network-based and requires no privileges. A victim must visit an attacker-controlled site or a compromised page hosting the malicious HTML. After interaction, the spoofed UI can mislead the user into approving sensitive permissions or believing they are operating on a trusted origin. Refer to the Chromium Issue Tracker #498405554 for additional technical context.

No public proof-of-concept code, exploit module, or in-the-wild exploitation has been reported. The CVE is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2026-11254

Indicators of Compromise

Browser telemetry showing Chrome versions earlier than 149.0.7827.53 in active use across managed endpoints.
User reports of unexpected permission prompts or UI elements that appear inconsistent with the visited site.
Web proxy logs recording visits to unfamiliar domains immediately preceding suspicious permission grants such as microphone, camera, or geolocation access.

Detection Strategies

Inventory installed Chrome versions through endpoint management or software asset tooling and flag instances below 149.0.7827.53.
Correlate browser version data with web traffic to identify users running vulnerable builds who visit untrusted external sites.
Review Chrome enterprise reporting for permission grants issued to low-reputation domains.

Monitoring Recommendations

Enable Chrome Enterprise Core reporting to centralize version, extension, and permission telemetry.
Monitor outbound DNS and HTTP traffic for newly registered domains hosting HTML content that triggers permission requests.
Track help desk tickets related to unexpected camera, microphone, or notification prompts as a behavioral signal.

How to Mitigate CVE-2026-11254

Immediate Actions Required

Update Google Chrome to version 149.0.7827.53 or later on all Windows, macOS, and Linux endpoints.
Force-restart Chrome processes after deployment to ensure the patched binary is loaded.
Validate update enforcement policies so end users cannot defer the upgrade indefinitely.

Patch Information

Google released the fix in the Stable channel update referenced in the Google Chrome Stable Update advisory. Administrators should deploy 149.0.7827.53 or a later Stable channel build. Chromium-based browsers such as Microsoft Edge, Brave, and Opera typically inherit the same fix once they rebase on the patched Chromium version.

Workarounds

Restrict Chrome permission grants via enterprise policy, requiring explicit administrator approval for sensitive capabilities such as camera and microphone access.
Train users to verify the origin shown in the address bar before approving any permission prompt.
Block known-malicious and newly registered domains at the web proxy or DNS layer until patching is complete.

bash

# Configuration example: Chrome enterprise policy to harden permission prompts
# Windows registry path: HKLM\Software\Policies\Google\Chrome
# macOS plist domain: com.google.Chrome

DefaultGeolocationSetting = 2      # Block geolocation by default
DefaultNotificationsSetting = 2    # Block notifications by default
AudioCaptureAllowed = false        # Block microphone by default
VideoCaptureAllowed = false        # Block camera by default
TargetVersionPrefix = "149.0.7827.53"