CVE-2026-79261 in Chrome
Summary
by MITRE • 08/26/2026
Incorrect authorization in Controls in Google Chrome prior to 152.0.7977.65 allowed a remote attacker to bypass web origin policy via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 08/26/2026
The vulnerability identified as an incorrect authorization issue within the controls of Google Chrome, specifically affecting versions prior to 152.0.7977.65, represents a significant deviation from expected browser security boundaries. This flaw centers on the enforcement mechanisms that govern how web pages interact with each other and with resources outside their designated origin context. In modern web browsers, the same-origin policy serves as a critical security mechanism designed to prevent malicious scripts on one page from obtaining access to sensitive data on another page. The vulnerability in question indicates that these controls failed to properly validate or restrict permissions when handling specific user interactions or state changes within the browser interface itself rather than just content rendered by web pages.
From a technical perspective, this flaw allows for an origin policy bypass through the use of a crafted HTML page. An attacker can construct a malicious webpage containing carefully engineered code that exploits the misconfigured authorization logic in Chrome's internal controls. By leveraging specific sequences of events or UI interactions, the attacker tricks the browser into granting elevated privileges to content that should remain sandboxed within its own origin. This bypass effectively neutralizes one of the primary defenses against cross-site scripting and data exfiltration attacks, allowing malicious code to access DOM elements, cookies, local storage, or other sensitive information belonging to different origins without proper authorization checks being triggered correctly by the browser engine.
The operational impact of this vulnerability is substantial for end-users who visit compromised websites while using an affected version of Chrome. A remote attacker can exploit this weakness to perform unauthorized actions on behalf of the user, such as stealing session tokens, reading private messages stored in local storage, or manipulating application state across different tabs and windows. This capability undermines the trust model that web applications rely upon for security. Although classified with a low severity rating by Chromium's internal metrics, likely due to the complexity required to successfully chain this flaw into a fully exploitable attack vector against hardened targets, it still poses a tangible risk in scenarios where users are targeted via phishing or drive-by download attacks on unpatched systems.
This type of vulnerability is commonly categorized under CWE-269, which refers to Improper Authorization, as the core issue lies in the failure to enforce proper access controls during specific operations within the browser's control plane. Furthermore, it aligns with MITRE ATT&CK techniques related to Browser Security Misconfiguration and potentially Cross-Site Scripting if exploited for data theft. The exploitation path typically involves social engineering or malicious ad networks delivering the crafted HTML payload that triggers the flawed authorization logic in the background controls of the browser UI.
To mitigate this risk, organizations and individual users must ensure that Google Chrome is updated to version 152.0.7977.65 or later immediately upon availability. Automatic update mechanisms should be verified as active to prevent exposure during windows where patches are available but not yet installed. Additionally, deploying browser isolation solutions or strict content security policies can provide an additional layer of defense by limiting the capabilities of scripts running in untrusted contexts. Security teams should also monitor for indicators of compromise associated with exploit kits that target known vulnerabilities in web browsers and enforce regular patch management cycles to minimize the window of exposure to such origin bypass flaws.