CVE-2026-14115: Google Chrome Privilege Escalation Flaw

CVE-2026-14115 Overview

CVE-2026-14115 affects the Cast component in Google Chrome versions prior to 150.0.7871.47. The vulnerability stems from insufficient validation of untrusted input [CWE-20]. A remote attacker who has already compromised the renderer process can leverage this flaw to escalate privileges through a crafted HTML page. Google's Chromium security team rated the underlying issue as Low severity, while the NVD assigns a CVSS score of 7.5 due to the potential impact on confidentiality, integrity, and availability. The affected Cast subsystem handles media routing to external devices such as Chromecast receivers. Successful exploitation requires prior renderer compromise and user interaction with attacker-controlled content.

Critical Impact
An attacker with a foothold in the renderer process can escape sandbox boundaries and gain elevated privileges on the host system across Windows, macOS, and Linux.

Affected Products

Google Chrome versions prior to 150.0.7871.47
Chromium-based browsers using the vulnerable Cast component
Deployments on Windows, macOS, and Linux desktop platforms

Discovery Timeline

2026-06-30 - CVE-2026-14115 published to NVD
2026-07-02 - Last updated in NVD database

Technical Details for CVE-2026-14115

Vulnerability Analysis

The flaw resides in the Cast feature of Google Chrome, which manages communication between the browser and external media receivers. Cast operates across privilege boundaries, receiving requests from renderer processes and executing actions in more privileged browser components. Insufficient validation of untrusted input within this trust boundary allows a compromised renderer to influence privileged operations. The vulnerability is chained rather than standalone. An attacker must first compromise the renderer through a separate flaw such as a JavaScript engine bug. Once the renderer is under attacker control, a crafted HTML page delivers input that bypasses validation checks in Cast, resulting in privilege escalation outside the renderer sandbox.

Root Cause

The root cause is classified under [CWE-20], Improper Input Validation. Cast accepts data crossing the renderer-to-browser boundary without applying sufficient checks on structure, type, or content. Browser process code that trusts this data can be manipulated to perform actions the renderer should not be authorized to trigger. This class of bug is common in inter-process communication paths where messages traverse security boundaries within Chromium's multi-process architecture.

Attack Vector

The attack vector is network-based and requires user interaction. A victim must load a crafted HTML page in a vulnerable Chrome build. The attacker must also possess a working renderer compromise, which raises attack complexity. After the renderer is subverted, the attacker sends malformed Cast messages to the browser process, exploiting the missing validation to escalate privileges. Technical specifics of the malformed messages are tracked in the Chromium Issue Tracker Entry, which remains access-restricted.

No verified public exploit code is available for this vulnerability. Refer to the Google Chrome Update Announcement for vendor guidance.

Detection Methods for CVE-2026-14115

Indicators of Compromise

Chrome browser processes spawning unexpected child processes or performing unusual privileged operations following renderer activity
Anomalous outbound connections to Cast-related endpoints from endpoints running outdated Chrome builds
Browser crash reports referencing the Cast component or media_router modules

Detection Strategies

Inventory Chrome installations and flag any version below 150.0.7871.47 as vulnerable
Monitor for renderer process crashes followed by privileged operations, which may indicate exploit chaining
Correlate browser telemetry with endpoint process trees to identify sandbox escape patterns

Monitoring Recommendations

Ingest browser version telemetry into a centralized data platform for continuous version compliance checks
Track process creation events where Chrome browser processes launch unexpected binaries after HTML rendering
Alert on network connections from Chrome to non-standard Cast discovery targets

How to Mitigate CVE-2026-14115

Immediate Actions Required

Update Google Chrome to version 150.0.7871.47 or later on all Windows, macOS, and Linux endpoints
Restart Chrome processes after deployment to ensure the patched binary is loaded
Verify update rollout across managed fleets using enterprise policy reporting

Patch Information

Google addressed CVE-2026-14115 in the stable channel release documented in the Google Chrome Update Announcement. The fix ships in Chrome 150.0.7871.47 and later. Enterprise administrators should use Chrome Browser Cloud Management or equivalent policy tooling to enforce the minimum version.

Workarounds

Disable Cast functionality via the EnableMediaRouter enterprise policy set to false where the feature is not required
Restrict browsing to trusted sites through URL allowlists to reduce exposure to crafted HTML pages
Deploy site isolation policies to strengthen renderer boundaries as a defense-in-depth measure

bash

# Configuration example: disable Media Router / Cast via enterprise policy
# Windows registry
reg add "HKLM\Software\Policies\Google\Chrome" /v EnableMediaRouter /t REG_DWORD /d 0 /f

# macOS
defaults write com.google.Chrome EnableMediaRouter -bool false

# Linux managed policy JSON (/etc/opt/chrome/policies/managed/cast.json)
{
  "EnableMediaRouter": false
}