CVE-2026-17824 in Chrome
Summary
by MITRE • 07/30/2026
Insufficient policy enforcement in ServiceWorker in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to bypass same origin policy via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 07/30/2026
The vulnerability under discussion represents a critical weakness in the service worker implementation within Google Chrome browsers, specifically affecting versions prior to 151.0.7922.72. This flaw stems from insufficient enforcement of security policies within the service worker architecture, which is designed to enable background operations and cache management for web applications. The same origin policy serves as a fundamental security mechanism that prevents scripts from one origin from accessing resources or data from another origin, thereby protecting users from cross-site scripting attacks and data leakage. However, this particular vulnerability creates an avenue for attackers to circumvent these protective measures through carefully crafted HTML pages.
The technical nature of this flaw lies in the improper validation and enforcement of access controls within service worker contexts. Service workers operate as background processes that can intercept network requests, manage caching, and handle push notifications without direct user interaction. When the policy enforcement mechanisms fail to properly validate the origin of incoming requests or operations, malicious actors can exploit this gap to execute unauthorized actions across different origins. The vulnerability manifests when a crafted HTML page attempts to manipulate service worker behavior in ways that should be restricted by the same origin policy. This allows attackers to potentially access resources, cookies, or data from different domains that would normally be protected by browser security boundaries.
The operational impact of this vulnerability extends beyond simple privilege escalation, creating potential pathways for data exfiltration, session hijacking, and cross-site request forgery attacks. Attackers could construct malicious web pages that, when visited by users, would enable service workers to access sensitive information from other domains or perform actions on behalf of users without their knowledge or consent. The medium severity classification reflects the significant risk this vulnerability poses to user privacy and application security, particularly in environments where users may encounter untrusted content or where applications rely heavily on service worker functionality for caching and offline operations.
This vulnerability aligns with CWE-693, which addresses Protection Mechanism Failure, specifically highlighting the inadequacy of access control mechanisms within web browser components. From an ATT&CK framework perspective, this flaw corresponds to techniques involving privilege escalation and credential access through browser-based attacks. The exploitation requires minimal user interaction beyond visiting a malicious webpage, making it particularly dangerous in phishing campaigns or when users browse untrusted websites. Organizations should prioritize updating their Chrome installations to version 151.0.7922.72 or later to address this vulnerability, while security teams should monitor for potential indicators of compromise related to service worker manipulation or unusual network activity from affected systems. Additionally, implementing content security policies and regularly auditing service worker implementations can provide additional protective layers against similar vulnerabilities in the future.
The remediation approach focuses primarily on updating to the patched Chrome version where proper policy enforcement has been restored. Security researchers and developers should also review their service worker implementations to ensure that access controls are properly configured and that no unnecessary permissions are granted to service workers. Browser vendors continue to enhance security mechanisms through regular updates, but organizations must maintain vigilant patch management practices to protect against known vulnerabilities that could be exploited in targeted attacks or mass exploitation campaigns.