CVE-2026-14115
Summary
by MITRE • 07/01/2026
Insufficient validation of untrusted input in Cast in Google Chrome prior to 150.0.7871.47 allowed a remote attacker who had compromised the renderer process to perform privilege escalation via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 07/01/2026
This vulnerability represents a critical privilege escalation flaw within Google Chrome's casting functionality that emerged prior to version 150.0.7871.47. The issue stems from insufficient validation of untrusted input within the cast component, creating a pathway for remote attackers who have already compromised the renderer process to elevate their privileges. The vulnerability specifically affects the way Chrome handles untrusted HTML content during casting operations, where the system fails to properly validate or sanitize input parameters that could be manipulated by malicious actors. This weakness enables an attacker with renderer-level access to potentially execute arbitrary code with elevated privileges, effectively bypassing the normal security boundaries that separate user-space processes from system-level operations.
The technical implementation of this vulnerability involves the cast component's failure to properly validate input parameters when processing crafted HTML content. When a malicious page is loaded in the renderer process, the cast functionality does not adequately sanitize or verify the legitimacy of input data, allowing an attacker to construct specific payloads that can manipulate the casting system. This flaw operates at the intersection of privilege separation mechanisms and input validation controls, where the renderer process should be isolated from direct system access but can be exploited to gain elevated privileges through improper input handling. The vulnerability is particularly concerning because it requires only a compromised renderer process to be effective, meaning an attacker who has already achieved initial compromise can leverage this weakness to escalate their privileges without requiring additional attack vectors.
The operational impact of this vulnerability extends beyond simple privilege escalation as it represents a significant breach in Chrome's security architecture. An attacker who successfully compromises the renderer process can use this vulnerability to execute code with elevated privileges, potentially allowing them to access sensitive system resources, modify system files, or establish persistence mechanisms within the target environment. The low chromium security severity classification may be misleading given the potential for privilege escalation, as this type of vulnerability can enable attackers to move laterally within a system and achieve more comprehensive control over the affected device. This flaw affects the fundamental security model of Chrome's multi-process architecture where renderer processes should remain isolated from privileged operations.
Mitigation strategies for this vulnerability should focus on immediate patching to version 150.0.7871.47 or later, which contains the necessary fixes to properly validate untrusted input within the cast functionality. Organizations should implement comprehensive monitoring for suspicious casting activities and ensure that all Chrome installations are kept current with security updates. The vulnerability aligns with CWE-20, which addresses improper input validation, and represents a specific instance of privilege escalation through insufficient validation. Security teams should also consider implementing additional network-level controls to monitor for unusual casting behavior and establish process isolation measures to limit the potential impact if such vulnerabilities are exploited in the wild. This particular weakness demonstrates how seemingly isolated components within complex software systems can create significant security risks when proper input validation is not implemented across all code paths.