CVE-2026-79276 Overview
CVE-2026-79276 is an improper privilege management vulnerability [CWE-269] in the FileSystem component of Google Chrome prior to version 152.0.7977.65. A remote attacker can leverage social engineering with a crafted HTML page to bypass system access restrictions in the browser. Google's Chromium security team assigned this issue a Medium severity rating. The flaw affects the browser's enforcement of file system access boundaries, which normally require explicit user consent before local resources are exposed to web content. Successful exploitation requires user interaction, so the attack chain depends on tricking a victim into visiting or interacting with attacker-controlled content.
Critical Impact
Attackers can bypass FileSystem access restrictions in Chrome, exposing local resources to malicious web pages when users are tricked into interaction.
Affected Products
- Google Chrome desktop versions prior to 152.0.7977.65
- Chromium-based browsers incorporating the vulnerable FileSystem component
- Stable channel Chrome deployments on Windows, macOS, and Linux
Discovery Timeline
- 2026-08-25 - CVE-2026-79276 published to NVD
- 2026-08-26 - Last updated in NVD database
Technical Details for CVE-2026-79276
Vulnerability Analysis
The vulnerability resides in Chrome's FileSystem implementation, which mediates web content access to local file resources. Improper privilege management [CWE-269] means the component does not correctly enforce the intended trust boundary between web origins and the underlying operating system. An attacker who convinces a victim to load a crafted HTML page can trigger code paths that bypass the normal access-restriction checks. Because the flaw is remotely reachable and depends on social engineering rather than pre-existing credentials, phishing pages, malicious ads, and compromised sites are viable delivery vectors. Google classified the Chromium severity as Medium, reflecting the required user interaction and the scope of the bypass.
Root Cause
The root cause is an insufficient privilege check in the FileSystem code path. The browser fails to properly validate whether a requesting origin holds the privileges required to reach specific file system operations. This allows a crafted page to exercise functionality the security model should have blocked. Detailed technical analysis is tracked in Chromium Issue #517580738.
Attack Vector
Exploitation requires a user to visit or interact with an attacker-controlled HTML page. The page issues FileSystem API calls or DOM operations that reach the vulnerable code path, bypassing the access restrictions Chrome normally enforces. No authentication is required, and no additional software must be installed on the victim host. The attacker relies on social engineering to drive traffic to the malicious page. See the Google Chrome Stable Update for release-level details.
No verified public exploit code is available. Refer to the linked Chromium issue and Chrome release notes for technical background.
Detection Methods for CVE-2026-79276
Indicators of Compromise
- Chrome browser processes running versions earlier than 152.0.7977.65 on managed endpoints
- Outbound connections from browser processes to newly registered or low-reputation domains following user clicks on links from email or messaging apps
- Unexpected browser prompts or file operations initiated shortly after visiting an untrusted page
Detection Strategies
- Inventory installed Chrome versions across the fleet and flag any host below 152.0.7977.65 as vulnerable.
- Correlate web proxy logs with endpoint telemetry to identify users who visited suspicious HTML content prior to anomalous file access events.
- Hunt for phishing lures that direct users to attacker-controlled pages instructing them to click, drag, or paste content into the browser window.
Monitoring Recommendations
- Track Chrome auto-update status and alert when endpoints remain on unpatched builds beyond the maintenance window.
- Monitor child processes spawned by chrome.exe and related renderer processes for unexpected file access outside standard sandbox paths.
- Log DNS and HTTP requests from browsers to identify traffic to domains hosting crafted HTML payloads targeting Chromium bugs.
How to Mitigate CVE-2026-79276
Immediate Actions Required
- Update Google Chrome to version 152.0.7977.65 or later on every managed endpoint.
- Restart the browser after the update to ensure the patched binaries are loaded into memory.
- Verify Chromium-based enterprise browsers have absorbed the corresponding upstream fix before allowing continued use.
Patch Information
Google released the fix in the Chrome Stable channel at version 152.0.7977.65. Deployment details are documented in the Google Chrome Stable Update release announcement, and the underlying defect is tracked in Chromium Issue #517580738. Administrators managing Chrome through enterprise policy should confirm the update has propagated across all channels in use.
Workarounds
- Enforce Chrome auto-update via enterprise policy so patched versions reach endpoints without user action.
- Restrict browsing to trusted sites through URL filtering and secure web gateway policies until patching completes.
- Deliver targeted user awareness reminders that reinforce caution around unsolicited links and social engineering lures.
# Verify installed Chrome version on Linux/macOS
google-chrome --version
# Windows: query the installed version from the registry
reg query "HKLM\SOFTWARE\Google\Chrome\BLBeacon" /v version
# Force policy-driven update refresh (Windows, elevated)
gpupdate /force
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
