CVE-2026-113196 in Chrome
Summary
by MITRE • 10/21/2026
Improper access control in Mobile in Google Chrome on on iOS prior to 156.0.8078.47 allowed a remote attacker to bypass web origin policy via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 10/21/2026
The vulnerability identified as an improper access control flaw within the mobile version of Google Chrome on iOS, specifically affecting versions prior to 156.0.8078.47, represents a significant deviation from expected browser isolation boundaries. This issue stems from a failure in the engine responsible for enforcing web origin policies, which are fundamental security mechanisms designed to prevent malicious scripts loaded from one origin from accessing data or interacting with resources belonging to another origin. In this specific instance, the flaw allowed a remote attacker to circumvent these restrictions by crafting a specialized HTML page that exploited inconsistencies in how Chrome on iOS handled cross-origin requests and resource access permissions. The severity of this vulnerability is classified as medium within the Chromium security framework, indicating that while it does not typically lead directly to arbitrary code execution or full system compromise, it poses a substantial risk to data confidentiality and integrity by enabling unauthorized information disclosure or state manipulation across different web domains.
From a technical perspective, origin policies rely on strict checks performed during the parsing and execution of web content to ensure that scripts adhere to their designated sandbox environments. The defect in Chrome for iOS likely involved an edge case where certain attributes or API calls were not correctly validated against the originating domain before granting access to sensitive objects such as cookies, local storage, or DOM elements from a different origin. By leveraging this misconfiguration through a crafted HTML page hosted on a malicious server, an attacker could trick a victim into loading content that subsequently accessed protected resources belonging to other sites where the user was authenticated. This bypass effectively breaks the isolation model that protects users from cross-site scripting attacks and data leakage scenarios, allowing the attacker to read or modify information that should remain inaccessible due to same-origin policy restrictions.
The operational impact of this vulnerability is primarily centered on privacy violations and potential account takeover attempts through session hijacking or sensitive data exfiltration. If a user visits a malicious site while logged into other services such as email providers, banking platforms, or social media networks, the attacker could potentially retrieve authentication tokens, personal identifiable information, or private messages stored in browser storage associated with those trusted origins. This capability undermines the trust model of the web ecosystem and can lead to severe consequences for end-users whose sensitive data is exposed without their consent. Furthermore, such vulnerabilities are often precursors to more complex attack chains where initial access gained through origin bypassing is used to escalate privileges or deploy further malware payloads within the context of trusted applications.
To mitigate this risk, users must ensure that Google Chrome on iOS is updated to version 156.0.8078.47 or later, which contains patches addressing these specific access control failures. Developers and security teams should also review their own implementations for similar patterns where origin checks might be bypassed due to improper validation of request headers or resource identifiers. Industry standards such as CWE-269, which covers Improper Privilege Management, and CWE-862, describing Missing Authorization Checks, provide a framework for understanding the root cause of this flaw. Additionally, from an offensive security perspective, this type of vulnerability aligns with MITRE ATT&CK techniques related to Collection via Browser Access or Data Staged in Local System Storage, highlighting the importance of maintaining strict origin boundaries and regularly updating browser software to close gaps that allow remote attackers to exploit trust relationships between different web origins.