CVE-2025-47963 is a medium-severity vulnerability identified in the Chromium-based Microsoft Edge browser, specifically affecting version 1.0.0.0. The vulnerability enables an unauthorized attacker to perform spoofing attacks over a network without requiring any privileges or authentication. Spoofing in this context likely refers to the attacker’s ability to deceive users or systems by falsifying information, such as URLs, web content, or network responses, potentially leading users to interact with malicious sites or content under the guise of legitimate ones. The CVSS 3.1 base score of 6.3 reflects that the attack vector is network-based (AV:N), with low attack complexity (AC:L), no privileges required (PR:N), but requires user interaction (UI:R). The impact affects confidentiality, integrity, and availability at a low level (C:L/I:L/A:L), indicating that while the attacker can cause some harm, it is limited in scope. The scope remains unchanged (S:U), meaning the vulnerability affects only the vulnerable component (Microsoft Edge) without impacting other components or systems. No known exploits are currently reported in the wild, and no patches or fixes have been linked yet. The absence of a CWE classification suggests the specific technical root cause or vulnerability class has not been fully detailed or categorized. Overall, this vulnerability represents a moderate risk primarily through social engineering or deceptive techniques that could mislead users into compromising their data or system integrity via the Edge browser on affected versions.

For European organizations, this vulnerability poses a moderate risk primarily in scenarios where employees use the affected Microsoft Edge version to access web resources. Spoofing attacks can lead to credential theft, unauthorized data access, or the delivery of malware if users are tricked into interacting with malicious content masquerading as legitimate. Given the network attack vector and requirement for user interaction, phishing campaigns leveraging this vulnerability could be particularly effective. Organizations in sectors with high regulatory requirements for data protection, such as finance, healthcare, and government, may face increased risks of data breaches or compliance violations if this vulnerability is exploited. Additionally, the integrity of communications and trust in web-based applications accessed via Edge could be undermined, potentially disrupting business operations. However, the impact is somewhat mitigated by the lack of known exploits and the medium severity rating, suggesting that immediate widespread exploitation is unlikely but should not be discounted.

European organizations should prioritize updating Microsoft Edge to versions beyond 1.0.0.0 as soon as patches become available from Microsoft. Until patches are released, organizations can implement network-level protections such as web filtering and DNS filtering to block access to known malicious domains and phishing sites. User awareness training should be enhanced to educate employees about the risks of spoofing and the importance of verifying URLs and site authenticity before entering sensitive information. Deploying endpoint security solutions with anti-phishing and web reputation capabilities can help detect and block spoofing attempts. Additionally, organizations should monitor network traffic for unusual patterns that may indicate spoofing or man-in-the-middle activities. Where feasible, enforcing multi-factor authentication (MFA) can reduce the impact of credential theft resulting from spoofing attacks. IT teams should also maintain an inventory of browser versions in use and restrict usage of outdated or vulnerable versions through group policies or endpoint management tools.