CVE-2026-79248 Overview
CVE-2026-79248 is an incorrect authorization vulnerability [CWE-863] in the Input component of Google Chrome. The flaw affects Chrome versions prior to 152.0.7977.65. A remote attacker who has already compromised the renderer process can bypass the web origin policy by serving a crafted HTML page. Google's Chromium security team assigned this issue Medium severity.
The vulnerability requires prior renderer compromise, which limits standalone exploitation but makes it valuable as part of a multi-stage exploit chain. Bypassing the same-origin policy lets an attacker read or manipulate resources across web origins, undermining a core browser security boundary.
Critical Impact
Bypass of the web origin policy from a compromised renderer, enabling cross-origin data access and privilege boundary violations in Chrome versions prior to 152.0.7977.65.
Affected Products
- Google Chrome for Desktop versions prior to 152.0.7977.65
- Chromium-based browsers incorporating the vulnerable Input component
- Downstream distributions that have not yet integrated the Chrome Stable channel update
Discovery Timeline
- 2026-08-25 - CVE-2026-79248 published to NVD
- 2026-08-26 - Last updated in NVD database
Technical Details for CVE-2026-79248
Vulnerability Analysis
The issue resides in Chrome's Input component and is classified as incorrect authorization [CWE-863]. Chrome enforces the web origin policy to prevent one origin from reading or modifying resources belonging to another. This vulnerability breaks that enforcement when input-related operations are dispatched from a renderer process that an attacker already controls.
Exploitation is a post-compromise capability. The attacker must first gain code execution or equivalent control inside a renderer, typically through a separate vulnerability such as a V8 or DOM memory corruption issue. Once inside the renderer, a crafted HTML page triggers the incorrect authorization path in the Input component and causes cross-origin operations to be treated as authorized.
The practical impact is confidentiality and integrity loss across origins. An attacker can pivot from a single compromised tab to interact with content owned by other origins loaded in the same browser session, which weakens Chrome's site isolation guarantees.
Root Cause
The root cause is missing or incorrect authorization checks in the Input component when handling operations that cross origin boundaries. The component trusts state or requests originating from the renderer without independently validating the target origin against the caller's origin.
Attack Vector
The attack vector is a crafted HTML page delivered to a renderer the attacker has already compromised. No additional user interaction beyond loading attacker-controlled content is required once the renderer is compromised. See the Chromium Issue #502918844 and the Google Chrome Stable Update for reference details.
No verified public exploit code is available. A prose description of the mechanism is provided above in place of synthetic exploitation code.
Detection Methods for CVE-2026-79248
Indicators of Compromise
- Chrome renderer processes making unexpected cross-origin requests or accessing storage tied to unrelated origins within the same session.
- Endpoints running Chrome versions earlier than 152.0.7977.65 after the Stable channel update has been released.
- Browser telemetry showing input event dispatch patterns that do not correlate with legitimate user interaction on the loaded origin.
Detection Strategies
- Inventory installed Chrome versions across managed endpoints and flag any build below 152.0.7977.65.
- Correlate web proxy logs with browser session data to surface cross-origin traffic that violates expected application boundaries.
- Hunt for precursor renderer compromise indicators such as unexpected child processes spawned by chrome.exe or anomalous sandbox escape attempts.
Monitoring Recommendations
- Ingest Chrome update status and version telemetry into your SIEM or data lake to track patch coverage over time.
- Monitor for exploit chain activity in which a renderer-level memory corruption CVE is combined with cross-origin data access.
- Alert on Chrome processes loading unusual HTML content immediately followed by cross-origin network requests to sensitive internal applications.
How to Mitigate CVE-2026-79248
Immediate Actions Required
- Update Google Chrome to version 152.0.7977.65 or later on all managed endpoints.
- Restart Chrome after the update to ensure the patched binaries are loaded into memory.
- Verify that downstream Chromium-based browsers have integrated the corresponding upstream fix before considering them remediated.
Patch Information
Google addressed CVE-2026-79248 in the Chrome Stable channel update that ships version 152.0.7977.65. Full release details are available in the Google Chrome Stable Update announcement and the tracking entry at Chromium Issue #502918844.
Workarounds
- Enforce Chrome auto-update through enterprise policy so users cannot defer the patched build.
- Restrict browsing to trusted sites using URL allowlists until patch deployment is confirmed across the fleet.
- Reduce renderer compromise risk by enabling site isolation and Enhanced Safe Browsing where operationally acceptable.
# Verify installed Chrome version on Linux endpoints
google-chrome --version
# Example minimum required version check
# Expected output should be: Google Chrome 152.0.7977.65 or later
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
