CVE-2025-29806 is a medium-severity vulnerability affecting Microsoft Edge (Chromium-based), specifically version 1.0.0.0. The vulnerability is classified under CWE-843, which corresponds to 'Access of Resource Using Incompatible Type' or 'Type Confusion'. This type of vulnerability arises when a program accesses a resource using a type that is incompatible with the actual type of the resource, potentially leading to unexpected behavior such as memory corruption or arbitrary code execution. In this case, the vulnerability allows an unauthorized attacker to execute code remotely over a network without requiring privileges or prior authentication, although user interaction is necessary to trigger the exploit. The CVSS 3.1 score is 6.5 (medium), with the vector indicating network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), user interaction required (UI:R), unchanged scope (S:U), high confidentiality impact (C:H), no integrity or availability impact (I:N/A:N), and a proof-of-concept exploit (E:P) with official remediation (RL:O) and confirmed report confidence (RC:C). The vulnerability does not currently have known exploits in the wild, and no patch links are provided yet. The presence of CWE-94 (Improper Control of Generation of Code) in the tags suggests that the vulnerability could be related to unsafe code generation or execution stemming from the type confusion. Overall, this vulnerability could allow attackers to execute arbitrary code remotely by tricking users into interacting with malicious content in Microsoft Edge, potentially compromising confidentiality of data handled by the browser.

For European organizations, this vulnerability poses a significant risk due to the widespread use of Microsoft Edge as a default or preferred browser in many enterprises and public sector institutions. Successful exploitation could lead to unauthorized disclosure of sensitive information accessed or processed through the browser, including corporate credentials, confidential communications, and personal data protected under GDPR. Although the vulnerability does not impact integrity or availability directly, the ability to execute arbitrary code remotely could enable attackers to establish footholds within organizational networks, escalate privileges, or deploy further malware. This is particularly concerning for sectors with high data sensitivity such as finance, healthcare, government, and critical infrastructure. The requirement for user interaction means that phishing or social engineering campaigns could be leveraged to trigger the exploit. Given the medium severity and the lack of known exploits currently, the immediate risk is moderate, but organizations should act proactively to mitigate potential future exploitation, especially as threat actors may develop exploits once patches are released or if proof-of-concept code becomes public.

European organizations should implement a multi-layered mitigation strategy beyond generic advice. First, they should monitor for official Microsoft security advisories and promptly apply patches once available, as no patch links are currently provided. Until patches are released, organizations should consider deploying application control policies to restrict execution of untrusted code and use browser security features such as Enhanced Protected Mode and strict site isolation to limit the impact of potential exploits. User awareness training should be enhanced to reduce the risk of social engineering attacks that require user interaction. Network-level protections like web filtering and intrusion detection systems should be tuned to detect and block known malicious payloads or suspicious network activity targeting Edge browsers. Additionally, organizations should audit and restrict browser extensions and plugins, as these can be vectors for exploitation. Endpoint detection and response (EDR) solutions should be configured to detect anomalous behavior indicative of exploitation attempts. Finally, organizations should consider temporary use of alternative browsers with no known vulnerabilities of this type until patches are applied.