CVE-2026-102310 in Chrome
Summary
by MITRE • 09/29/2026
Missing authorization in Payments in Google Chrome prior to 154.0.8037.92 allowed a remote attacker who had compromised the renderer process to bypass web origin policy via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 09/29/2026
The vulnerability identified as missing authorization within the payment handling subsystem of Google Chrome prior to version 154.0.8037.92 represents a critical failure in access control mechanisms that governs how sensitive financial data is processed and transmitted. This flaw specifically impacts the browser's ability to enforce strict boundaries between different web origins, which are fundamental security constructs designed to isolate content from distinct sources. When an attacker successfully compromises the renderer process of a malicious webpage through other vectors such as cross-site scripting or remote code execution exploits, they gain the capability to interact with internal browser APIs that handle payment requests. The core technical deficiency lies in the absence of proper authorization checks when these API calls are initiated by untrusted contexts, allowing the compromised renderer to bypass standard web origin policies and access protected resources intended for privileged processes only.
From a technical perspective, this issue stems from an improper implementation of security controls within the Chromium architecture's payment flow logic. The browser relies on strict separation between low-privilege renderer processes and higher-privilege utility or browser processes to maintain stability and security. However, in versions preceding 154.0.8037.92, the validation step that verifies whether a request originates from an authorized origin was either missing or insufficiently rigorous. This oversight permits a malicious script running within a sandboxed renderer environment to forge requests that appear legitimate to the payment subsystem. Consequently, the attacker can manipulate transaction details, initiate unauthorized payments, or exfiltrate sensitive financial information without triggering standard security alerts or requiring user interaction beyond what is typically expected for normal browsing activities.
The operational impact of this vulnerability is significant despite its classification as low severity by Chromium standards, primarily because it requires an initial compromise of the renderer process to be exploited. This prerequisite means that standalone exploitation via a single web page visit is unlikely unless combined with other vulnerabilities such as zero-day exploits in JavaScript engines or rendering components. Nevertheless, for users who frequently engage in online banking or e-commerce transactions on potentially untrusted websites, the risk profile increases substantially if any of those sites are vulnerable to code injection attacks. An attacker leveraging this flaw could potentially redirect payments to fraudulent accounts, steal credit card tokens stored by autofill features, or conduct phishing operations that appear authentic due to their proximity to legitimate payment interfaces within the browser's UI layer.
This vulnerability aligns with CWE-269, which denotes Improper Privilege Assignment, as it involves a process executing actions without being properly authorized for them. Furthermore, in terms of offensive security frameworks like MITRE ATT&CK, this behavior corresponds to techniques involving privilege escalation and defense evasion within the browser environment. It facilitates lateral movement from a compromised web context into more sensitive system areas, effectively bridging the gap between client-side script execution and backend transaction processing. The lack of robust origin verification allows attackers to maintain persistence or expand their foothold by abusing trusted payment APIs that are typically shielded from external interference.
Mitigation strategies for this vulnerability primarily involve immediate software updates rather than configuration changes. Users must upgrade Google Chrome to version 154.0.8037.92 or later, where the authorization checks have been reinforced to ensure that only legitimate origins can invoke payment-related functions. Additionally, organizations should enforce strict content security policies on internal web applications and employ browser isolation technologies for high-risk activities such as online banking. Security awareness training remains crucial, emphasizing caution when interacting with untrusted websites even if they do not immediately exhibit signs of compromise, as renderer process compromises often occur silently through complex exploit chains that evade basic detection mechanisms.