CVE-2025-8583: Google Chrome XSS Vulnerability

CVE-2025-8583 Overview

CVE-2025-8583 is a user interface (UI) spoofing vulnerability in the Permissions component of Google Chrome. The flaw affects Chrome versions prior to 139.0.7258.66 across Windows, macOS, and Linux desktop builds. A remote attacker can exploit the issue by serving a crafted HTML page that manipulates permission-related UI elements. Successful exploitation enables the attacker to mislead users about the origin or intent of a permission prompt, supporting phishing and social engineering campaigns. Google classified the Chromium security severity as Low, and the issue is tracked under CWE-451: User Interface (UI) Misrepresentation of Critical Information. The vulnerability requires user interaction and does not provide code execution.

Critical Impact
A remote attacker can spoof Chrome permission UI through a crafted HTML page, enabling deceptive prompts that facilitate credential theft and unauthorized permission grants.

Affected Products

Google Chrome versions prior to 139.0.7258.66 on Microsoft Windows
Google Chrome versions prior to 139.0.7258.66 on Apple macOS
Google Chrome versions prior to 139.0.7258.66 on Linux

Discovery Timeline

2025-08-07 - CVE-2025-8583 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-8583

Vulnerability Analysis

The vulnerability resides in the Permissions subsystem of Chrome, which governs prompts for capabilities such as geolocation, camera, microphone, notifications, and clipboard access. An inappropriate implementation allows a crafted HTML page to influence the presentation of these permission dialogs. Attackers can leverage this to display prompts that misrepresent the requesting origin or the action being authorized. The issue falls under [CWE-451], where security-relevant information is not conveyed accurately to the user. Exploitation is network-based, requires user interaction, and yields limited integrity impact without affecting confidentiality or availability.

Root Cause

The root cause is improper handling of UI state within the Permissions component when rendering prompts triggered from adversarial content. Chrome does not sufficiently anchor permission dialog context to the true requesting origin under specific crafted DOM or navigation conditions. This gap allows a malicious page to induce misleading prompt presentation. See the Chromium Issue Report for engineering-level context.

Attack Vector

The attacker hosts a crafted HTML page and lures the target into visiting it, typically through phishing, malvertising, or a compromised site. The page manipulates permission prompt behavior so that the user misidentifies the origin or the requested capability. If the user accepts the prompt, the attacker gains a permission the user did not intend to grant, such as access to notifications, location, or media devices. No authentication, elevated privileges, or memory corruption primitives are involved. Because no verified proof-of-concept has been published, no exploitation code is reproduced here. Refer to the Google Chrome Update Announcement for vendor details.

Detection Methods for CVE-2025-8583

Indicators of Compromise

Chrome browser process versions reporting below 139.0.7258.66 in endpoint inventory telemetry.
Web proxy or DNS logs showing user navigation to newly registered or low-reputation domains hosting HTML content that invokes the Permissions API.
Unexpected permission grants (notifications, geolocation, camera, microphone) recorded in Chrome enterprise reporting for domains outside the sanctioned allow-list.

Detection Strategies

Deploy version-based vulnerability scanning against installed Chrome builds to identify hosts running versions earlier than 139.0.7258.66.
Correlate browser telemetry with URL categorization to flag sessions where permission prompts originate from uncategorized or suspicious domains.
Use Chrome Enterprise Reporting to audit permission grant events and alert on anomalies against baseline user behavior.

Monitoring Recommendations

Monitor Chrome auto-update status across the fleet and generate alerts when endpoints fall behind the current stable channel.
Track outbound HTTPS connections to domains flagged for phishing or brand impersonation, which are common delivery vectors for UI spoofing content.
Review user-reported phishing submissions for patterns involving permission prompts or fake browser dialogs.

How to Mitigate CVE-2025-8583

Immediate Actions Required

Update Google Chrome to version 139.0.7258.66 or later on all Windows, macOS, and Linux endpoints.
Verify that Chrome auto-update is enabled and functioning through the chrome://settings/help page or enterprise policy.
Restart Chrome after the update installs to ensure the patched binaries are loaded.

Patch Information

Google released the fix in the stable channel update for desktop announced on the Chrome Releases blog. Enterprise administrators should deploy the update via managed channels such as Chrome Browser Cloud Management, Group Policy, or software distribution tooling. The engineering fix is tracked in the Chromium Issue Report.

Workarounds

Restrict browsing to trusted sites using enterprise URL filtering while the update is being deployed.
Configure Chrome enterprise policies such as DefaultNotificationsSetting, DefaultGeolocationSetting, and DefaultMediaStreamSetting to block or require explicit approval for sensitive permissions.
Deliver targeted user awareness communications instructing users to deny unexpected permission prompts and verify the URL bar before granting access.

bash

# Example Chrome enterprise policy (Linux managed policy JSON) to block permissions by default
# /etc/opt/chrome/policies/managed/permissions.json
{
  "DefaultNotificationsSetting": 2,
  "DefaultGeolocationSetting": 2,
  "DefaultMediaStreamSetting": 2,
  "DefaultSensorsSetting": 2
}