CVE-2026-92069 in Firefox
Summary
by MITRE • 09/15/2026
Spoofing issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 156 and Firefox ESR 153.3.
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Analysis
by VulDB Data Team • 09/15/2026
The identified security flaw resides within the Document Object Model navigation components of Mozilla Firefox, specifically affecting versions prior to 156 and Firefox Extended Support Release version 153.3. This vulnerability is classified as a spoofing issue, which fundamentally relates to an attacker's ability to deceive users regarding the true origin or state of web content being displayed in the browser interface. In modern web browsers, the navigation bar serves as the primary visual indicator for users to verify the legitimacy and security context of the website they are interacting with. When this component is compromised through spoofing techniques, it creates a disconnect between what the user perceives on screen and the actual network request being executed by the browser engine.
The technical mechanism behind this flaw typically involves improper handling of URL states or navigation events within the DOM API layer. An attacker could potentially manipulate the presentation logic to display a trusted domain name in the address bar while simultaneously loading content from an untrusted, malicious source. This discrepancy undermines the user's trust in the browser's security indicators, such as padlock icons and certificate validation displays. By exploiting this inconsistency, threat actors can execute sophisticated phishing campaigns where victims are led to believe they are on a legitimate login page or secure transaction site, while their credentials or sensitive data are actually being exfiltrated to an attacker-controlled server. This type of vulnerability is particularly dangerous because it bypasses user vigilance that relies heavily on visual cues provided by the browser's UI layer rather than deep technical inspection of network traffic.
From a classification perspective, this issue aligns with CWE-201: Insertion of Sensitive Information into Sent Data when considering how malicious actors might leverage interface inconsistencies to capture sensitive inputs under false pretenses, and more accurately maps to CWE-798: Use of Hard-coded Credentials if the spoofing involves static deceptive elements. However, its primary categorization falls under the broader umbrella of UI Redressing or Spoofing attacks as defined in common vulnerability enumerations for web applications. In terms of offensive security frameworks, this behavior corresponds directly to MITRE ATT&CK technique T1498: Network Sniffing if used in conjunction with other tools, but more precisely aligns with T1566.002: Spearphishing Link when the spoofed navigation is part of a larger social engineering campaign designed to trick users into interacting with malicious content under false guises. The core risk lies in the erosion of trust in the browser's interface, which serves as the first line of defense for end-users against online threats.
The operational impact of this vulnerability extends beyond simple credential theft. It can facilitate drive-by download attacks if the spoofed navigation leads to a site hosting malicious payloads that appear legitimate enough for users to disable security warnings or execute scripts. Furthermore, it compromises the integrity of single sign-on processes and multi-factor authentication flows by presenting fake prompts within the trusted browser context. Users who rely on visual confirmation of domain names may inadvertently authorize transactions or disclose personal information because the interface suggests a secure environment. This undermines the fundamental principle of least privilege in user interaction models, where users are expected to make informed decisions based on accurate system feedback.
Mitigation for this vulnerability was addressed in Firefox version 156 and Firefox ESR 153.3 through rigorous updates to the DOM navigation handling logic. The fix likely involves stricter validation of URL states during asynchronous operations and ensuring that UI elements accurately reflect the actual network context without race conditions or state manipulation opportunities. For organizations still running older versions, immediate upgrade is critical as no workaround exists other than updating the browser software. Security administrators should enforce automated update policies to ensure all endpoints are patched against known spoofing vectors. Additionally, users can mitigate residual risks by manually verifying domain names in the address bar and enabling strict phishing protection features within the browser settings. Continuous monitoring for anomalous navigation patterns and educating end-users about the limitations of visual security indicators remain essential complementary measures alongside software patching to maintain a robust defense posture against interface-based attacks.