CVE-2026-95376 in Chrome
Summary
by MITRE • 09/29/2026
Externally controlled reference in DevTools in Google Chrome prior to 154.0.8037.57 allowed an adjacent attacker leveraging social engineering to bypass system access restrictions via crafted network traffic. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 09/29/2026
The vulnerability identified as a flaw within the Developer Tools component of Google Chrome versions prior to 154.0.8037.57 represents a critical failure in input validation and reference management mechanisms. Specifically, this issue is classified under CWE-20 Improper Input Validation or potentially CWE-916 if it involves control over code execution paths through crafted references. The core technical flaw lies in the application's handling of externally controlled data within its debugging interface. When a user interacts with DevTools to inspect network traffic or manipulate client-side resources, the browser fails to adequately sanitize or validate references provided by external sources. This lack of rigorous validation allows an attacker who can influence these inputs to construct malicious payloads that exploit internal logic errors in how Chrome processes and renders web content during debugging sessions.
The operational impact of this vulnerability is significant due to its reliance on social engineering for exploitation. An adjacent attacker, which typically refers to a threat actor operating within the same network segment or having some level of local access, can leverage crafted network traffic to trigger the flaw. By presenting a specially constructed URL or resource reference that appears legitimate but contains maliciously formatted elements, an adversary can trick a victim into opening it in Chrome with DevTools active or configured for inspection. Once triggered, this manipulation allows the attacker to bypass system access restrictions. This bypass capability is particularly dangerous as it undermines the browser's sandboxing model and isolation boundaries, potentially granting unauthorized read or write access to sensitive data stored locally on the user's device or allowing interaction with internal APIs that should remain inaccessible to standard web content.
From a threat intelligence perspective, this vulnerability aligns with MITRE ATT&CK techniques related to Initial Access via Spearphishing Link (T1566.002) and potentially Execution through Browser Exploitation if the bypass leads to code execution. The medium severity rating assigned by Chromium reflects that while exploitation requires user interaction and specific conditions, the resulting privilege escalation or data exfiltration capabilities pose a tangible risk to confidentiality and integrity. Attackers often utilize such flaws in conjunction with other social engineering tactics to lower victim defenses, making the combination of technical exploitability and human factor manipulation particularly effective for targeted attacks against high-value targets within corporate networks.
Mitigation strategies must focus on both immediate patching and long-term defensive posture improvements. The primary remediation is to update Google Chrome to version 154.0.8037.57 or later, where the input validation logic in DevTools has been corrected to properly reject malformed references. For organizations unable to immediately deploy patches, network-level controls such as deep packet inspection can be configured to detect and block traffic containing known malicious patterns associated with this exploit vector. Additionally, enforcing strict Content Security Policies (CSP) across web applications reduces the attack surface by limiting which resources can be loaded or executed within the browser environment. User awareness training is also critical; employees should be educated on the risks of opening unfamiliar links in browsers with developer tools enabled and advised to disable DevTools features when not actively engaged in debugging tasks to minimize exposure to such manipulation techniques.