CVE-2026-79082 in Chrome
Summary
by MITRE • 08/26/2026
Incorrect authorization in Transactions Platform in Google Chrome prior to 152.0.7977.65 allowed a remote attacker who had compromised the renderer process to bypass web origin policy via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 08/26/2026
The vulnerability identified as an incorrect authorization flaw within Google Chrome's Transactions Platform prior to version 152.0.7977.65 represents a significant breach in the browser's multi-process architecture isolation mechanisms. This issue specifically affects the Chromium security subsystem, where the renderer process is responsible for executing web content such as HTML, JavaScript, and CSS. Under normal circumstances, these processes operate within strict sandbox boundaries to prevent malicious code from accessing sensitive system resources or user data outside its designated origin context. However, this specific flaw allowed a remote attacker who had already achieved compromise of the renderer process through an initial vector like a drive-by download or phishing site to escalate privileges and bypass web origin policies. The core technical failure lies in the improper validation of authorization tokens or permissions when interacting with transaction-related APIs, which are designed to handle sensitive financial data exchanges securely.
From a technical perspective, this vulnerability exploits weaknesses in how the browser validates context boundaries during inter-process communication related to payment transactions. Web origins define the scope of resources that a web page can access, including cookies, local storage, and DOM elements from other pages on different domains. By crafting a specific HTML payload that triggers an unauthorized transaction API call, an attacker could manipulate the renderer process into performing actions outside its permitted origin. This bypass effectively neutralizes one of the primary defenses against Cross-Site Scripting (XSS) and data exfiltration attacks within modern browsers. The severity is classified as High because it enables a remote code execution scenario that leads to unauthorized access to sensitive user information, potentially including financial credentials or personal identifiable information stored in browser storage mechanisms associated with transaction platforms.
The operational impact of this vulnerability extends beyond simple data leakage; it undermines the fundamental trust model of web browsing. An attacker leveraging this flaw could silently intercept and modify payment transactions, redirect funds, or steal session tokens that grant access to banking portals without user interaction. This capability transforms a standard cross-site scripting scenario into a more potent attack vector capable of financial fraud and identity theft. The existence of such a bypass means that even if the initial entry point is contained within a sandboxed renderer process, the attacker can pivot to compromise higher-privilege components or exfiltrate data across origin boundaries with impunity. This poses severe risks for users engaging in e-commerce activities, online banking, or any web-based financial operations using affected versions of Chrome.
Mitigation strategies primarily involve immediate software updates to address the underlying authorization logic errors within the Transactions Platform codebase. Users must upgrade Google Chrome to version 152.0.7977.65 or later where these permission checks have been hardened and validated against cross-origin requests. For organizations managing large fleets of devices, deploying automated patch management systems is critical to ensure rapid dissemination of this security fix across all endpoints. Additionally, implementing Content Security Policy headers can provide an additional layer of defense by restricting the sources from which scripts are allowed to execute, thereby reducing the attack surface for initial renderer compromise attempts that precede exploitation of this specific flaw.
This vulnerability aligns with Common Weakness Enumeration identifier CWE-269, which describes Improper Authorization where a user is able to access or perform functions they should not be permitted to do. In the context of browser security architecture, it also relates to CWE-829, involving Inclusion of Functionality from Untrusted Control Sources if the transaction platform improperly trusts input derived from external origins during processing. Furthermore, within the MITRE ATT&CK framework for enterprise cybersecurity, this behavior maps to T1059 Command and Scripting Interpreter under Execution techniques, specifically when leveraging browser APIs for malicious purposes, and potentially T1078 Valid Accounts if session hijacking is facilitated through origin bypasses. Understanding these mappings helps security teams prioritize remediation efforts based on established threat intelligence standards and vulnerability classification systems used globally in incident response planning.