CVE-2026-15778 in Chrome
Summary
by MITRE • 07/15/2026
Insufficient validation of untrusted input in Navigation in Google Chrome prior to 150.0.7871.125 allowed a remote attacker who had compromised the renderer process to bypass navigation restrictions via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 07/15/2026
This vulnerability represents a critical flaw in Google Chrome's navigation handling mechanism that emerged from insufficient validation of untrusted input within the browser's navigation framework. The issue specifically affected versions prior to 150.0.7871.125 and enabled remote attackers who had already compromised the renderer process to bypass established navigation restrictions through carefully crafted HTML content. The vulnerability stems from the browser's failure to properly validate user-supplied data when processing navigation commands, creating an avenue for privilege escalation within the browser's security model.
The technical implementation of this flaw involves the manipulation of navigation parameters that should normally be restricted or validated before execution. When a renderer process is compromised, attackers can inject malicious HTML code that exploits the insufficient input validation to force navigation to arbitrary destinations or bypass security controls that would typically prevent such actions. This represents a classic example of how vulnerabilities in input sanitization can create pathways for attackers to circumvent security boundaries within complex software systems.
The operational impact of this vulnerability is significant as it allows attackers who have already achieved initial compromise through other means to escalate their privileges further within the browser environment. The Medium severity classification reflects the requirement for an existing compromised renderer process, but the potential for bypassing navigation restrictions makes this particularly dangerous in targeted attacks where attackers seek to maintain persistence or move laterally within a compromised system. This vulnerability aligns with CWE-20, which covers 'Improper Input Validation,' and demonstrates how inadequate validation can create security weaknesses that allow attackers to manipulate application behavior.
From an attack perspective, this vulnerability fits into the broader ATT&CK framework under the 'Defense Evasion' and 'Privilege Escalation' tactics. The attacker must first compromise the renderer process through techniques such as memory corruption or other initial access vectors, then leverage this vulnerability to bypass additional security controls within the browser's navigation system. This creates a multi-stage attack pattern where the initial compromise is followed by exploitation of browser-level security mechanisms.
The recommended mitigation strategy involves immediate deployment of Chrome version 150.0.7871.125 or later, which includes the necessary input validation fixes to prevent the exploitation of this vulnerability. Organizations should also implement additional monitoring for suspicious navigation patterns and ensure comprehensive patch management processes are in place. Security teams should consider implementing browser hardening measures such as content security policies and restricted browsing environments to limit the potential impact of similar vulnerabilities. The fix addresses the root cause by implementing proper validation of untrusted input before processing navigation commands, thereby preventing malicious HTML content from bypassing established security controls.