CVE-2025-29806 is a vulnerability identified in Microsoft Edge (Chromium-based) version 1.0.0.0, classified under CWE-843 (Access of Resource Using Incompatible Type, or type confusion). This flaw arises when the browser incorrectly handles data types internally, allowing an attacker to manipulate memory or program logic unexpectedly. Exploitation can lead to unauthorized remote code execution without requiring any privileges on the target system, but it does require user interaction, such as visiting a malicious website or opening crafted content. The vulnerability impacts confidentiality by potentially exposing sensitive data through code execution but does not affect integrity or availability. The CVSS 3.1 score of 6.5 indicates a medium severity, with attack vector being network-based (AV:N), low attack complexity (AC:L), no privileges required (PR:N), but user interaction is necessary (UI:R). The scope remains unchanged (S:U), and the impact is high on confidentiality (C:H), none on integrity (I:N) and availability (A:N). Although no public exploits are currently known, the vulnerability is recognized by Microsoft and CISA, indicating the need for vigilance. The lack of available patches at the time of publication suggests organizations should apply interim mitigations and monitor for updates. This vulnerability is particularly relevant for environments where Microsoft Edge is widely deployed, especially in enterprise settings where sensitive data is accessed via the browser.

For European organizations, this vulnerability poses a risk of unauthorized remote code execution through a widely used browser, potentially leading to data breaches or espionage. Confidentiality is the primary concern, as attackers could execute code to extract sensitive information without altering data or disrupting services. The requirement for user interaction limits mass exploitation but targeted phishing or watering hole attacks could be effective. Organizations in sectors such as finance, government, healthcare, and critical infrastructure are at higher risk due to the sensitivity of data accessed via browsers. The vulnerability could also facilitate lateral movement within networks if exploited. Given Microsoft Edge's significant market share in Europe, especially in corporate environments, the potential impact is substantial if unmitigated. The absence of known exploits reduces immediate risk but does not eliminate the threat, especially as exploit development could follow disclosure.

1. Monitor Microsoft security advisories and promptly apply official patches or updates for Microsoft Edge once released. 2. Until patches are available, restrict access to Microsoft Edge version 1.0.0.0 by enforcing browser updates through enterprise management tools. 3. Implement network-level protections such as web filtering and intrusion prevention systems to block access to known malicious sites and suspicious payloads. 4. Enhance user awareness training focusing on phishing and social engineering to reduce the risk of user interaction with malicious content. 5. Employ application whitelisting and endpoint detection and response (EDR) solutions to detect and prevent unauthorized code execution. 6. Limit browser privileges and sandboxing capabilities to reduce the impact of potential exploitation. 7. Conduct regular vulnerability assessments and penetration testing to identify and remediate related security gaps. 8. Consider deploying alternative browsers or hardened configurations in high-risk environments until the vulnerability is resolved.