CVE-2026-17959 in Chrome
Summary
by MITRE • 07/30/2026
Inappropriate implementation in Network 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: Low)
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents an insufficient input validation and access control issue within the network stack of google chrome browser version 151.0.7922.72 and earlier. The flaw stems from improper handling of cross-origin resource requests where the browser fails to adequately enforce same-origin policies during network operations. Attackers can exploit this weakness by crafting malicious html pages that manipulate network requests to access data from different origins without proper authorization. The vulnerability resides in the browser's security model implementation, specifically how it manages inter-domain communication and resource isolation.
The technical execution of this attack involves leveraging the browser's network processing capabilities to bypass security boundaries that should prevent cross-origin data leakage. When a user visits a malicious webpage, the crafted html code can trigger network requests that inadvertently expose information from other origins through improper response handling or data flow management within the browser's networking layer. This represents a classic case of insufficient sandboxing or origin enforcement mechanisms that allow unauthorized data access patterns.
The operational impact of this vulnerability extends beyond simple information disclosure as it compromises fundamental web security principles that protect user privacy and application integrity. An attacker could potentially gather sensitive data from various origins including corporate networks, personal accounts, or other web applications that users have authenticated with. The low severity classification does not diminish the potential risk since even limited cross-origin data leakage can provide attackers with valuable information for further exploitation or social engineering attacks. This vulnerability aligns with common weakness enumerations such as cwe-200 Information Exposure and potentially cwe-284 Improper Access Control.
Mitigation strategies should focus on immediate browser updates to versions 151.0.7922.72 or later where the vulnerability has been patched. Organizations should implement comprehensive network monitoring to detect unusual cross-origin communication patterns that might indicate exploitation attempts. Browser security configurations should be reviewed and hardened, including strict enforcement of content security policies. Additionally, user education regarding safe browsing practices and recognition of potentially malicious websites remains crucial. The fix likely involved strengthening origin validation checks within the browser's networking components and ensuring proper isolation of cross-origin requests to prevent unintended data exposure through network processing pathways. This vulnerability demonstrates the ongoing need for rigorous security testing of browser components and highlights how seemingly minor implementation flaws can create significant security risks in complex web ecosystems.