CVE-2026-17783 in Chrome
Summary
by MITRE • 07/30/2026
Inappropriate implementation in Loader in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: Medium)
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 07/30/2026
The vulnerability in question represents a cross-origin data leakage issue within the loader component of Google Chrome versions prior to 151.0.7922.72, classified as a medium severity concern by Chromium security standards. This flaw stems from an inadequate implementation of cross-origin resource handling mechanisms that fails to properly enforce security boundaries between different origin contexts. The vulnerability specifically affects the browser's loader functionality which is responsible for processing and executing various web resources including scripts, stylesheets, and other embedded content.
The technical exploitation of this vulnerability occurs through a crafted HTML page that manipulates the loader's behavior to access data from different origins than intended. This cross-origin information disclosure stems from insufficient validation of resource origins during the loading process, allowing malicious actors to construct pages that can indirectly access or infer information from resources hosted on different domains. The flaw essentially bypasses the same-origin policy enforcement mechanisms that normally prevent such unauthorized data access.
From an operational perspective, this vulnerability could enable remote attackers to gather sensitive information from cross-origin resources without proper authorization. The impact extends beyond simple data leakage as it potentially allows for more sophisticated attacks including session hijacking, credential theft, or information gathering for further exploitation. Attackers could construct malicious web pages that leverage this flaw to access cookies, local storage data, or other cross-origin resources that should normally be protected by browser security policies.
The vulnerability aligns with CWE-200, which covers "Information Exposure," and represents a failure in proper access control mechanisms within the browser's resource loading infrastructure. It also relates to ATT&CK technique T1566, which involves social engineering through malicious web content delivery. The medium severity classification indicates that while the vulnerability is not immediately critical, it poses significant risks to user privacy and data protection when exploited in combination with other attack vectors.
Mitigation strategies should focus on updating to Chrome version 151.0.7922.72 or later where this vulnerability has been addressed through improved cross-origin resource handling and enhanced loader security controls. Organizations should also implement additional network-level protections including web application firewalls and content security policies to limit the potential impact of such vulnerabilities. Regular browser updates remain critical as this class of vulnerability typically requires core browser engine modifications to resolve completely, making timely patch deployment essential for maintaining secure browsing environments.