CVE-2026-79141 in Chrome
Summary
by MITRE • 08/26/2026
Incorrect authorization in Browser 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: Medium)
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Analysis
by VulDB Data Team • 08/26/2026
The vulnerability identified as an incorrect authorization flaw within the browser component of Google Chrome, specifically affecting versions prior to 152.0.7977.65, represents a significant breach in web origin policy enforcement. This issue stems from a logic error or implementation oversight that allows a remote attacker to circumvent the Same-Origin Policy (SOP), which is a critical security mechanism designed to isolate potentially malicious documents from sensitive data residing on other origins. By crafting a specific HTML page, an adversary can exploit this misconfiguration to access resources, such as cookies, local storage, or DOM elements, that are restricted to different domains under normal circumstances. The Chromium project has classified the security severity of this flaw as Medium, indicating that while it may not lead directly to full system compromise in all scenarios, it provides a substantial foothold for further exploitation and data exfiltration.
From a technical perspective, web origin policies rely on strict checks performed by the browser engine during resource loading and script execution. When these checks fail due to incorrect authorization logic, the boundary between trusted and untrusted content becomes porous. An attacker can leverage this weakness through cross-site scripting or cross-origin read bypass techniques, where malicious scripts embedded in a crafted webpage execute within the context of a victim's session on a target site. This allows the extraction of sensitive information that was intended to remain isolated from external parties. The exploitation typically requires social engineering elements, such as tricking a user into visiting the malicious page while logged into their accounts on other sites, thereby amplifying the potential impact beyond mere technical access.
The operational impact of this vulnerability is primarily centered around data confidentiality and integrity. Successful exploitation enables unauthorized reading of private information stored within the browser's local storage or session cookies for affected domains. This can lead to account takeover scenarios if session tokens are harvested, allowing attackers to impersonate legitimate users without needing their credentials. Furthermore, access to internal APIs or dynamic content loaded via AJAX requests from different origins could expose business logic details or proprietary data structures. For enterprise environments relying on Chrome as the primary browser, this vulnerability poses a risk of insider threats escalating into external breaches if employees inadvertently interact with malicious links while authenticated to corporate web applications.
To mitigate the risks associated with this flaw, organizations and individual users must ensure that Google Chrome is updated to version 152.0.7977.65 or later immediately upon availability. This patch addresses the underlying authorization logic errors within the browser engine, restoring strict adherence to origin policies. In addition to software updates, security administrators should enforce content security policies (CSP) across web applications hosted by their organization to provide an additional layer of defense against cross-origin data leakage. Monitoring for unusual patterns in network traffic that might indicate active exploitation attempts can also aid in early detection. Users are advised to exercise caution when interacting with links from untrusted sources and to utilize browser extensions or settings that restrict third-party cookie access where feasible, thereby reducing the attack surface available to adversaries attempting to leverage similar vulnerabilities.
This incident aligns with common vulnerability classifications found in industry standards such as CWE-269, which denotes Improper Privilege Management, specifically regarding unauthorized control of security-critical functionality. It also relates closely to CWE-359, Exposed Private Personal Information, due to the potential for sensitive data exposure through origin policy bypasses. In terms of offensive tactics, this vulnerability supports techniques categorized under MITRE ATT&CK as Cross-Site Scripting or potentially Data from Local System depending on the specific vector used by the attacker. Understanding these mappings helps security teams prioritize remediation efforts and align their defensive strategies with established frameworks for threat mitigation and incident response planning.