CVE-2026-11246 in Chrome
Summary
by MITRE • 06/05/2026
Insufficient validation of untrusted input in IndexedDB in Google Chrome prior to 149.0.7827.53 allowed a remote attacker who had compromised the renderer process to bypass same origin policy via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 06/05/2026
This vulnerability resides in the IndexedDB implementation within Google Chrome browsers prior to version 149.0.7827.53, representing a critical flaw in the browser's handling of untrusted input within its client-side database system. The vulnerability stems from insufficient validation mechanisms that fail to properly sanitize or verify data inputs before processing them within the IndexedDB storage layer. When an attacker successfully compromises the renderer process through other means, they can leverage this weakness to craft malicious HTML pages that exploit the inadequate input validation. The security implications extend beyond simple data corruption, as the flaw enables attackers to bypass the fundamental same origin policy that serves as a cornerstone of web security architecture.
The technical exploitation occurs through the manipulation of IndexedDB operations where untrusted input flows directly into database operations without proper sanitization or validation checks. This creates a pathway for attackers to perform unauthorized cross-origin data access or manipulation, effectively undermining the browser's security model. The vulnerability's classification as low severity by Chromium security team belies its potential impact on the overall security posture, as it represents a privilege escalation vector that can be leveraged by attackers who have already gained access to the renderer process. The flaw operates at the intersection of browser security boundaries, where the separation between different origins becomes compromised due to inadequate input validation.
The operational impact of this vulnerability extends beyond immediate data access or modification capabilities. Attackers can potentially extract sensitive information from other origins' IndexedDB stores, manipulate stored data, or establish persistent access patterns that could be used for further exploitation. This weakness particularly affects environments where multiple origins are accessed within the same browser context, as it provides a mechanism for lateral movement between different security domains. The vulnerability's exploitation requires an initial compromise of the renderer process, but once achieved, it can be used to perform operations that would normally be restricted by the same origin policy.
Mitigation strategies should focus on immediate browser updates to version 149.0.7827.53 or later, which incorporates proper input validation mechanisms for IndexedDB operations. Organizations should also implement additional monitoring for suspicious IndexedDB activities and consider network-level controls to detect anomalous data access patterns. Security teams should review their incident response procedures to account for potential cross-origin data access scenarios and ensure proper isolation of sensitive data within browser environments. The vulnerability aligns with CWE-20, which addresses "Improper Input Validation," and represents a specific instance of how inadequate validation can lead to privilege escalation and policy bypass. From an ATT&CK perspective, this vulnerability maps to techniques involving privilege escalation and persistence within the browser environment, potentially enabling attackers to maintain access and expand their operational capabilities.