CVE-2026-29858 is a Local File Inclusion (LFI) vulnerability identified in aaPanel version 7.57.0, a popular web hosting control panel. The root cause is a lack of proper path validation when handling file inclusion requests, classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). This flaw allows an attacker to craft a specially designed request that tricks the application into including arbitrary local files. Since the vulnerability is remotely exploitable without authentication or user interaction, an attacker can leverage it to read sensitive files such as configuration files, password stores, or other critical data residing on the server. The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N) indicates network attack vector, low attack complexity, no privileges or user interaction required, unchanged scope, and high confidentiality impact with no integrity or availability impact. Although no public exploits or patches are currently available, the vulnerability's nature and impact make it a critical concern for organizations using aaPanel. The absence of patch links suggests that vendors or maintainers have yet to release a fix, emphasizing the need for immediate mitigation strategies.

The primary impact of this vulnerability is the unauthorized disclosure of sensitive information stored on the affected server. Attackers can access configuration files, credentials, or other sensitive data that could facilitate further attacks such as privilege escalation, lateral movement, or data breaches. Since aaPanel is widely used in web hosting environments, exploitation could compromise multiple hosted websites or services, leading to reputational damage, regulatory penalties, and financial loss. The vulnerability does not directly affect system integrity or availability but significantly undermines confidentiality. Organizations relying on aaPanel for server management, especially those hosting sensitive or regulated data, face increased risk. The lack of authentication requirement and ease of exploitation broaden the potential attack surface, making automated scanning and mass exploitation plausible once public exploits emerge.

Until an official patch is released, organizations should implement the following mitigations: 1) Restrict access to the aaPanel management interface by IP whitelisting or VPN-only access to reduce exposure to untrusted networks. 2) Employ web application firewalls (WAFs) with custom rules to detect and block suspicious file inclusion patterns or path traversal attempts targeting aaPanel endpoints. 3) Conduct thorough auditing and monitoring of server logs to identify anomalous requests indicative of LFI exploitation attempts. 4) Harden server file permissions to limit the readability of sensitive files by the web server process, minimizing the impact of successful LFI exploitation. 5) Consider temporarily disabling or isolating vulnerable aaPanel instances in high-risk environments until patches are available. 6) Stay updated with vendor advisories and apply patches promptly once released. 7) Educate system administrators about the vulnerability and encourage proactive incident response planning.