CVE-2024-8908: Google Chrome Autofill XSS Vulnerability

CVE-2024-8908 Overview

CVE-2024-8908 is a user interface (UI) spoofing vulnerability affecting Google Chrome versions prior to 129.0.6668.58. The flaw resides in the browser's Autofill component and stems from an inappropriate implementation that allows a remote attacker to manipulate what users see. An attacker who convinces a user to visit a crafted HTML page can misrepresent Autofill UI elements. Chromium classifies the security severity as Low, and the issue maps to [CWE-290: Authentication Bypass by Spoofing]. Exploitation requires user interaction and does not directly compromise data confidentiality or system availability.

Critical Impact
Remote attackers can leverage a crafted webpage to spoof Autofill UI, potentially tricking users into disclosing form data or accepting unintended actions.

Affected Products

Google Chrome (Desktop) versions prior to 129.0.6668.58
Chromium-based browsers incorporating the vulnerable Autofill component
Downstream distributions that had not yet integrated the Stable Channel update

Discovery Timeline

2024-09-17 - CVE-2024-8908 published to NVD following the Chrome Stable Channel update for Desktop
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-8908

Vulnerability Analysis

The vulnerability affects the Autofill subsystem in Chrome. Autofill is responsible for suggesting saved form values such as addresses, payment cards, and credentials to users. The inappropriate implementation allows a crafted HTML page to manipulate how Autofill prompts or suggestion surfaces are rendered. As a result, an attacker can present misleading UI that appears to originate from the browser's trusted chrome. Users relying on visual trust cues in Autofill dropdowns may act on spoofed content and submit data they would otherwise withhold. Because the flaw impacts presentation logic rather than memory safety, no code execution occurs; the confidentiality boundary is limited to what a user voluntarily enters into a spoofed prompt.

Root Cause

The root cause is an implementation weakness in Autofill's UI rendering path that fails to enforce origin or context integrity when displaying prompts. This aligns with [CWE-290] behavior where trusted UI elements can be imitated or repositioned by attacker-controlled page content. The Chromium team addressed the underlying logic in release 129.0.6668.58.

Attack Vector

Exploitation requires the victim to load an attacker-controlled HTML page. The page manipulates DOM structure, overlays, or timing to induce Autofill to render in a misleading state. No authentication or elevated privileges are required, and the attack is delivered over the network. The technical details are described in the Chromium Issue Tracker #337222641 and the Google Chrome Stable Update advisory.

No public proof-of-concept code has been verified for this issue. Refer to the linked Chromium tracker entry for authoritative technical details.

Detection Methods for CVE-2024-8908

Indicators of Compromise

Chrome browser versions reporting build numbers earlier than 129.0.6668.58 in endpoint inventory data
User reports of Autofill prompts appearing on unfamiliar pages or in unexpected page regions
Web traffic to newly registered domains hosting form-heavy landing pages that mimic legitimate services

Detection Strategies

Query endpoint management data to identify Chrome installations that have not received the Stable Channel update from September 17, 2024
Correlate browser telemetry with phishing-adjacent indicators such as typosquatted domains and credential-collection form patterns
Monitor secure web gateway logs for HTML pages that trigger unusual overlay or iframe behavior against Autofill flows

Monitoring Recommendations

Enforce browser version reporting through enterprise management policies and alert on out-of-date Chrome builds
Review user-submitted phishing reports for evidence of spoofed Autofill prompts against corporate applications
Track EPSS trends for the CVE, currently 0.371%, as an input to prioritization rather than as a standalone signal

How to Mitigate CVE-2024-8908

Immediate Actions Required

Update Google Chrome to version 129.0.6668.58 or later on all managed endpoints
Restart Chrome after the update to ensure the patched Autofill component is loaded
Communicate the risk of UI spoofing to end users and reinforce verification of URL bar contents before submitting sensitive form data

Patch Information

Google released the fix in the Stable Channel update for Desktop on September 17, 2024. Details are published in the Google Chrome Stable Update advisory, and the underlying issue is tracked at Chromium Issue Tracker #337222641. Chromium-based browsers should apply their vendor's corresponding update that incorporates the fix.

Workarounds

Disable Autofill for addresses and payment methods in Chrome settings until the update is deployed
Restrict browsing to trusted sites through enterprise web filtering while patches are being rolled out
Educate users to cancel Autofill suggestions that appear outside expected form fields

bash

# Example: enforce minimum Chrome version via Group Policy on Windows
# Set the following registry value to require managed updates
reg add "HKLM\Software\Policies\Google\Update" /v UpdateDefault /t REG_DWORD /d 1 /f
reg add "HKLM\Software\Policies\Google\Chrome" /v TargetVersionPrefix /t REG_SZ /d "129.0.6668.58" /f