CVE-2026-106297 in Chrome
Summary
by MITRE • 10/06/2026
Incorrect authorization in Scheduling in Google Chrome prior to 155.0.8059.39 allowed a remote attacker to bypass web origin policy via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as an incorrect authorization flaw within the scheduling mechanisms of Google Chrome, specifically in versions prior to 155.0.8059.39, represents a significant deviation from expected browser security boundaries. This issue stems from a logic error where the browser failed to properly enforce origin-based restrictions during specific asynchronous operations or scheduled tasks. In modern web architectures, browsers rely heavily on the Same-Origin Policy (SOP) and Cross-Origin Resource Sharing (CORS) protocols to isolate content from different origins. When these policies are bypassed through improper authorization checks within internal scheduling subsystems, it allows a remote attacker to execute actions that should be restricted by the browser's security model. The Chromium project has classified this vulnerability with a Low severity rating, indicating that while the flaw is exploitable and violates core web isolation principles, its practical impact may be limited by other mitigating factors or the complexity required for successful exploitation in real-world scenarios.
From a technical perspective, the root cause lies in how Chrome handles permissions when processing scheduled events or timers associated with cross-origin contexts. Typically, when a script from one origin attempts to interact with resources or APIs belonging to another origin, the browser performs strict checks to ensure the requesting context has explicit permission via headers like Access-Control-Allow-Origin. In this specific instance, the scheduling component likely failed to validate these permissions before allowing certain operations to proceed. This oversight enables an attacker who controls a malicious HTML page hosted on a different domain to trigger actions that leak sensitive data or manipulate state in a target origin without proper consent. The attack vector is remote and requires user interaction, typically involving the victim visiting a crafted webpage designed to exploit this timing or authorization gap within the browser's engine.
The operational impact of this vulnerability centers on the potential for unauthorized access to cross-origin resources. Although classified as low severity, any bypass of web origin policies undermines the fundamental trust model of the internet. An attacker could potentially read sensitive information from a victim’s session with a trusted site if that data is accessible through an API or endpoint vulnerable to this scheduling flaw. This aligns closely with CWE-269, which describes Improper Authorization, where a user acts outside their intended permissions. Furthermore, in the context of the MITRE ATT&CK framework for enterprise security, such vulnerabilities are often associated with techniques that facilitate data exfiltration or lateral movement within web-based environments by bypassing browser-enforced sandbox boundaries. The ability to circumvent origin checks can lead to session hijacking scenarios if combined with other weaknesses like Cross-Site Scripting (XSS), although this specific CVE focuses on the authorization failure itself rather than script injection.
Mitigation for this vulnerability primarily involves updating Google Chrome to version 155.0.8059.39 or later, where the scheduling logic has been corrected to enforce strict origin checks before executing cross-origin operations. For organizations managing large fleets of devices, ensuring automatic update policies are in place is critical to closing this window of exposure. Additionally, developers should adhere to secure coding practices that validate permissions at every layer of interaction with external resources. Implementing Content Security Policy (CSP) headers can provide an additional layer of defense by restricting the sources from which content can be loaded and executed, thereby reducing the attack surface even if a browser-level vulnerability is present. Regular security audits focusing on cross-origin interactions and rigorous testing of authorization logic in asynchronous workflows are recommended to prevent similar flaws in future software releases.