CVE-2025-14327 in Firefox
Summary
by MITRE • 12/09/2025
Spoofing issue in the Downloads Panel component. This vulnerability affects Firefox < 146, Thunderbird < 146, Firefox ESR < 140.7, and Thunderbird < 140.7.
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Analysis
by VulDB Data Team • 01/15/2026
The vulnerability identified as CVE-2025-14327 represents a spoofing issue within the Downloads Panel component of Mozilla's browser applications, specifically affecting versions prior to 146 for Firefox and Thunderbird, and 140.7 for their respective ESR releases. This type of vulnerability falls under the broader category of user interface deception attacks that can manipulate user perception and trust in the application's interface. The Downloads Panel serves as a critical user interface element where users can monitor and manage their downloaded files, making it an attractive target for threat actors seeking to deceive users into performing unintended actions. The vulnerability stems from insufficient validation and sanitization of download metadata, allowing malicious actors to potentially manipulate the display of download information, file names, or progress indicators to mislead users about the nature or status of their downloads.
The technical flaw manifests in the way the Downloads Panel component processes and renders information about ongoing or completed downloads. This issue likely involves improper handling of file attributes, such as file names, paths, or metadata, which could be manipulated through crafted download requests or compromised download sources. The vulnerability creates a window of opportunity for attackers to present misleading information to users, potentially causing them to inadvertently execute malicious files or make decisions based on false information about their downloads. This type of spoofing attack can be particularly dangerous in phishing scenarios where users might be tricked into downloading and executing malware by being deceived about the actual nature of the files they are downloading. The flaw aligns with CWE-601 which specifically addresses URL redirection and forwarding vulnerabilities, and potentially CWE-20 which covers input validation issues in software components. The attack surface is particularly concerning given that the Downloads Panel is a frequently used interface element that users interact with regularly, making it an effective vector for social engineering attacks.
The operational impact of CVE-2025-14327 extends beyond simple user deception, potentially enabling more sophisticated attack vectors including malware distribution, credential theft, and system compromise. Users who are deceived by the spoofed download information might unknowingly execute malicious files, install harmful extensions, or provide sensitive information to attackers who have crafted deceptive download experiences. The vulnerability is particularly concerning in enterprise environments where users may be less vigilant about download activities or where security awareness training may be insufficient. The widespread use of Firefox and Thunderbird across different operating systems and user bases amplifies the potential impact, as the vulnerability affects both consumer and enterprise users. This type of vulnerability can be exploited in targeted attacks against specific organizations or can be part of broader campaign efforts where attackers leverage the deception to gain initial access to systems. The threat landscape is further complicated by the fact that users often trust the applications they are using, making spoofing attacks particularly effective at bypassing traditional security controls and user skepticism.
Organizations and users must implement immediate mitigations to address this vulnerability, including updating to the patched versions of Firefox and Thunderbird as soon as possible. The recommended approach involves deploying automated patch management systems to ensure all affected installations are updated promptly, while also implementing network monitoring to detect potentially malicious download activities. Security teams should consider implementing additional layers of protection such as application whitelisting, download scanning, and user behavior monitoring to detect potential exploitation attempts. Network administrators should review firewall rules and content filtering policies to prevent access to known malicious download sources, while also considering the implementation of sandboxing techniques for download handling processes. Users should be educated about the potential risks associated with downloading files from untrusted sources and trained to verify file integrity and source authenticity before executing any downloaded content. The vulnerability also highlights the importance of maintaining updated security tooling and implementing comprehensive endpoint detection and response capabilities to identify and mitigate potential exploitation attempts. Organizations should conduct regular vulnerability assessments to identify similar issues in other components of their browser-based applications and ensure that their security policies include specific guidance for download management and verification procedures.