CVE-2026-29515 is an authentication bypass vulnerability categorized under CWE-303, found in the embedded SwiFTP FTP server component of MiCode FileExplorer. The vulnerability arises from an incorrect implementation of the authentication algorithm within the PASS command handler. Normally, FTP servers require valid username and password credentials to authenticate users. However, in this case, the PASS command handler accepts any arbitrary username and password combination without validation, effectively bypassing authentication. This flaw allows remote attackers to gain unauthorized access to the FTP server without any privileges or user interaction. Once access is granted, attackers can perform a full range of file operations including listing directory contents, reading files, writing new files, and deleting existing files exposed by the FTP server. The vulnerability affects all versions of MiCode FileExplorer as indicated by the affectedVersions field. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N) reflects that the attack can be performed remotely over the network with low attack complexity, no privileges or user interaction required, and results in high confidentiality and integrity impacts. No patches or mitigations have been published yet, and no known exploits are reported in the wild, but the critical severity score underscores the urgent need for remediation. The vulnerability poses a significant risk to any organization using MiCode FileExplorer, especially those exposing the FTP server to untrusted networks.

The impact of CVE-2026-29515 is severe for organizations worldwide using MiCode FileExplorer. The authentication bypass allows attackers to gain full unauthorized access to the FTP server, compromising confidentiality by exposing sensitive files, integrity by allowing modification or deletion of files, and availability by potentially deleting critical data. Since the vulnerability requires no authentication or user interaction and can be exploited remotely, it greatly increases the attack surface. Organizations that expose the FTP server to the internet or untrusted networks are at high risk of data breaches, data loss, and potential disruption of business operations. The ability to write files could also enable attackers to upload malicious payloads, leading to further compromise such as malware deployment or lateral movement within networks. The lack of available patches means organizations must rely on temporary mitigations, increasing the window of exposure. This vulnerability could be particularly damaging in sectors handling sensitive or regulated data, such as finance, healthcare, and government, where unauthorized data access or modification can have legal and reputational consequences.

Given the absence of official patches, organizations should immediately implement network-level mitigations to restrict access to the MiCode FileExplorer FTP server. This includes firewall rules limiting FTP access to trusted IP addresses only and disabling FTP services on devices not requiring external access. Network segmentation should be applied to isolate systems running MiCode FileExplorer from critical infrastructure. Monitoring and logging of FTP server access should be enhanced to detect any unauthorized or suspicious activity promptly. If possible, disable or uninstall the embedded SwiFTP FTP server component until a patch is available. Organizations should also consider using alternative secure file transfer solutions that do not have this vulnerability. Regularly check for vendor updates or security advisories for patches or official mitigations. Finally, conduct an internal audit to identify sensitive data exposed via the FTP server and prepare incident response plans in case of exploitation.