CVE-2026-95330 in Chrome
Summary
by MITRE • 09/29/2026
Improper state validation in Downloads in Google Chrome prior to 154.0.8037.57 allowed a remote attacker to bypass system access restrictions via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 09/29/2026
The vulnerability identified as an improper state validation issue within the download functionality of Google Chrome, specifically affecting versions prior to 154.0.8037.57, represents a significant breach in browser-level access control mechanisms. This flaw stems from inadequate verification of the application's internal state during the handling of file downloads initiated by web content. When a user interacts with a maliciously crafted HTML page hosted on a remote server, the browser fails to properly validate whether the download operation is authorized under current security policies or sandbox constraints. The attacker leverages this logic error to execute actions that should be restricted, effectively bypassing system access restrictions designed to protect the local environment from untrusted web content.
From a technical perspective, the core of this vulnerability lies in the race condition or state management failure within the download manager component of the Chromium engine. Modern browsers employ strict sandboxing and permission models to isolate web pages from the underlying operating system. However, when processing downloads, certain operations require elevated privileges or specific user confirmations. The flaw allows a remote attacker to manipulate these processes by sending crafted requests that exploit gaps in state validation logic. By carefully timing or structuring the HTML payload, the attacker can trick the browser into treating an unauthorized download request as legitimate, thereby circumventing checks that would normally prevent such actions. This type of issue is commonly categorized under CWE-20: Improper Input Validation and often relates to CWE-862: Missing Authorization, as the application fails to enforce proper access control policies before executing sensitive operations.
The operational impact of this vulnerability is substantial for end-users who rely on Chrome for secure web browsing. A successful exploitation allows a remote attacker to bypass system-level security boundaries without requiring physical access or prior compromise of user credentials. This can lead to unauthorized file downloads, potential data exfiltration if the downloaded content contains sensitive information from other sources, or further lateral movement within a networked environment depending on how the downloaded files are handled by subsequent applications. The severity is rated as Medium because while it does not directly provide arbitrary code execution in most scenarios, it undermines the fundamental trust model of the browser and can serve as an initial vector for more complex attacks involving social engineering or additional exploit chains targeting installed software that processes the downloaded artifacts.
To mitigate this risk, organizations and individual users must ensure that Google Chrome is updated to version 154.0.8037.57 or later immediately upon availability. Patch management systems should be configured to prioritize security updates for web browsers due to their high exposure to remote threats. Additionally, deploying browser isolation technologies or content filtering solutions can provide an additional layer of defense by restricting the types of files that can be downloaded from untrusted domains. Users should also maintain strict browsing hygiene, avoiding interaction with suspicious links and disabling automatic downloads where possible. From a defensive security operations perspective, monitoring for unusual download patterns originating from web servers may help detect exploitation attempts in real-time. This vulnerability aligns with ATT&CK technique T1059: Command and Scripting Interpreter if the downloaded content is executed, or T1105: Ingress Tool Transfer when used to stage additional payloads, highlighting the importance of maintaining up-to-date defenses against web-based attack vectors.