CVE-2025-8364 is a security vulnerability identified in Mozilla Firefox for Android versions prior to 141. The issue involves address bar spoofing through the use of a crafted blob: URI. Blob URIs are used to represent binary data objects within the browser, and in this case, a maliciously crafted blob URI can obscure the true origin of the webpage displayed to the user. This means that an attacker can create a URL that appears legitimate in the address bar but actually loads content from a different, potentially malicious source. This spoofing can mislead users into believing they are visiting a trusted site, increasing the risk of phishing attacks or the execution of malicious scripts. The vulnerability is specific to the Android operating system; other platforms running Firefox are not affected. There is no indication that this vulnerability requires user authentication or interaction beyond visiting the crafted URL. No known exploits are currently reported in the wild, and no official patches or CVSS scores have been published at this time. The lack of a CVSS score suggests the vulnerability is newly disclosed and under evaluation. However, the potential for address bar spoofing is a significant concern in browser security, as it directly undermines user trust and the fundamental security model of the web browser.

For European organizations, this vulnerability poses a notable risk primarily in the context of phishing and social engineering attacks. Since Firefox is a widely used browser on Android devices across Europe, attackers could exploit this flaw to craft deceptive URLs that appear to originate from legitimate corporate or financial websites. This could lead to credential theft, unauthorized access to sensitive information, or the spread of malware. Organizations with employees or customers who rely on Firefox for Android are particularly vulnerable to targeted spear-phishing campaigns leveraging this spoofing technique. The impact extends to sectors with high-value targets such as finance, government, and critical infrastructure, where trust in web communications is paramount. Additionally, the vulnerability could be exploited to bypass security controls that rely on URL verification, potentially facilitating further compromise. Although no active exploitation has been reported, the ease of creating spoofed URLs and the widespread use of mobile browsers in Europe elevate the threat level. The Android-specific nature means that organizations with mobile-first or BYOD policies should be especially vigilant.

Organizations should prioritize updating Firefox for Android to version 141 or later as soon as it becomes available, as this will likely include a fix for the vulnerability. Until then, specific mitigations include educating users about the risks of clicking on suspicious links, especially those received via email or messaging apps. Security teams should implement mobile device management (MDM) policies to enforce browser updates and restrict installation of untrusted applications. Additionally, deploying advanced email filtering and URL scanning solutions can help detect and block phishing attempts leveraging spoofed URLs. Web security gateways and endpoint protection platforms should be configured to analyze blob URIs and flag anomalous behavior. For critical systems, consider restricting access to sensitive web applications from mobile browsers or enforcing multi-factor authentication to reduce the risk of credential compromise. Monitoring network traffic for unusual patterns related to blob URI usage may also provide early detection of exploitation attempts. Finally, organizations should stay informed through Mozilla security advisories and CVE updates to apply patches promptly.