CVE-2026-87594 Overview
CVE-2026-87594 is an incorrect authorization vulnerability [CWE-863] in the DataTransfer component of Google Chrome. The flaw affects Chrome versions prior to 153.0.8010.36. A remote attacker who has already compromised the renderer process can obtain sensitive information by serving a crafted HTML page to the victim. Google classifies the Chromium security severity as Medium.
The vulnerability requires user interaction and a pre-existing renderer compromise, which raises the exploitation bar. However, successful exploitation exposes confidential data handled through Chrome's drag-and-drop and clipboard DataTransfer interfaces.
Critical Impact
An attacker controlling a compromised renderer process can bypass authorization checks in DataTransfer and exfiltrate sensitive information from the browser context.
Affected Products
- Google Chrome versions prior to 153.0.8010.36
- Chromium-based browsers incorporating the vulnerable DataTransfer implementation
- Desktop Chrome Stable channel installations pre-update
Discovery Timeline
- 2026-09-09 - CVE-2026-87594 published to the National Vulnerability Database
- 2026-09-09 - Last updated in the NVD database
Technical Details for CVE-2026-87594
Vulnerability Analysis
The vulnerability resides in Chrome's DataTransfer interface, which manages data exchange during drag-and-drop and clipboard operations. Incorrect authorization checks allow a compromised renderer to access DataTransfer contents it should not be permitted to read.
Exploitation depends on two conditions. First, the attacker must have already compromised the renderer process through a separate flaw. Second, the victim must interact with a crafted HTML page. Under these conditions, the attacker can pull sensitive information across the browser's security boundaries.
For additional technical context, refer to the Chromium Issue Tracker Entry and the Google Chrome Stable Update advisory.
Root Cause
The root cause is classified under [CWE-863] Incorrect Authorization. Chrome's DataTransfer code path performs authorization checks that do not correctly validate the origin or context of the request. This weakness allows a renderer operating outside its intended trust boundary to read data belonging to other origins.
Attack Vector
The attack vector is network-based with high attack complexity and required user interaction. The attacker hosts a crafted HTML page and lures the victim to visit it. After leveraging a prior renderer compromise, the attacker triggers DataTransfer operations to read cross-origin data that should be inaccessible.
No public proof-of-concept exploit is available. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.
Detection Methods for CVE-2026-87594
Indicators of Compromise
- Chrome installations reporting build versions earlier than 153.0.8010.36 on the Stable channel
- Unexpected renderer process crashes or child process anomalies preceding data access events
- Outbound network connections from browser processes to unfamiliar hosts following user visits to untrusted pages
Detection Strategies
- Inventory Chrome versions across managed endpoints and flag hosts running builds prior to 153.0.8010.36
- Monitor browser telemetry for anomalous clipboard or drag-and-drop event sequences originating from untrusted origins
- Correlate renderer process crash reports with subsequent suspicious network activity to identify chained exploitation attempts
Monitoring Recommendations
- Enable Chrome Enterprise reporting to centralize version and crash telemetry
- Alert on browser child processes spawning unexpected network egress after visits to newly registered domains
- Track user-reported page rendering anomalies that could indicate crafted HTML delivery
How to Mitigate CVE-2026-87594
Immediate Actions Required
- Update Google Chrome to version 153.0.8010.36 or later on all managed endpoints
- Verify Chromium-based browsers derived from the same upstream have applied the corresponding fix
- Restart browser sessions after patching to ensure the vulnerable renderer code is unloaded
Patch Information
Google addressed the flaw in Chrome 153.0.8010.36 on the Stable channel. Patch details are available in the Google Chrome Stable Update release notes. Enterprise administrators should deploy the update through standard channels such as Chrome Enterprise, MDM, or package management systems.
Workarounds
- Restrict user browsing to trusted sites through enterprise web filtering while patching is in progress
- Deploy strict Content Security Policy headers on internally hosted applications to reduce cross-origin exposure
- Educate users to avoid interacting with unsolicited HTML content or drag-and-drop prompts from untrusted sources
# Verify installed Chrome version on Linux/macOS endpoints
google-chrome --version
# Windows PowerShell equivalent
(Get-Item "C:\Program Files\Google\Chrome\Application\chrome.exe").VersionInfo.ProductVersion
# Compare output against fixed version: 153.0.8010.36
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
