CVE-2026-79024 in Chrome
Summary
by MITRE • 08/26/2026
Information leak in ServiceWorker in Google Chrome prior to 152.0.7977.65 allowed a remote attacker to obtain sensitive information 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 information leak within the Service Worker component of Google Chrome represents a significant breach in web application isolation and data confidentiality. Prior to version 152.0.7977.65, the implementation of the Service Workers API contained flaws that allowed for the unintended exposure of sensitive internal state or cross-origin data. Service Workers act as network proxies sitting between web applications and the network, enabling features such as offline caching, push notifications, and background synchronization. Due to their privileged access to HTTP requests and responses, they operate with a higher level of trust than standard JavaScript running in browser tabs. When this component fails to properly sanitize or isolate data during processing, it creates an avenue for remote attackers to extract information that should remain confined within the scope of specific origins or internal browser processes.
From a technical perspective, the flaw likely stems from improper handling of shared state or memory regions accessible by Service Workers across different contexts. In many such vulnerabilities, the issue arises when data intended for one origin is inadvertently made available to another through race conditions, insufficient checks on cross-origin requests, or flawed serialization mechanisms within the worker lifecycle. A remote attacker could craft a malicious HTML page that leverages JavaScript to interact with compromised or vulnerable Service Worker instances. By exploiting these interactions, the attacker can trigger actions that cause the browser to expose sensitive information, such as authentication tokens, session identifiers, or private user data stored in cache storage. This type of vulnerability is particularly dangerous because it bypasses traditional same-origin policies if the isolation boundaries are not strictly enforced during worker execution and message passing.
The operational impact of this vulnerability allows a remote attacker to obtain sensitive information without requiring any physical access or prior authentication on the target system, provided the user visits the crafted webpage. This aligns with the ATT&CK technique T1059, specifically command and scripting interpreter abuse via JavaScript, although in this context it is used for data exfiltration rather than direct execution of arbitrary code. The CWE classification for this issue falls under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor. This exposure can lead to severe consequences including account takeover, session hijacking, and further exploitation through social engineering based on the leaked personal or corporate data. For enterprise environments relying on Chrome for secure web browsing, such vulnerabilities undermine trust in the browser's ability to protect user privacy and maintain application integrity.
Mitigation strategies primarily involve updating Google Chrome to version 152.0.7977.65 or later, where these specific flaws have been addressed by developers through stricter enforcement of origin checks and improved isolation mechanisms within the Service Worker architecture. Organizations should ensure that automatic updates are enabled for all endpoints running affected versions of the browser. Additionally, security teams can implement Content Security Policy (CSP) directives to restrict the execution of inline scripts and limit the sources from which services workers can be registered, thereby reducing the attack surface available to potential exploiters. Regular monitoring of vulnerability disclosures related to web browsers is essential for maintaining a robust defense-in-depth posture against evolving web-based threats.