CVE-2026-113507 in aaPanel
Summary
by MITRE • 10/20/2026
A vulnerability was found in aaPanel up to 8.25.0. The impacted element is the function GetClientIp of the file class/public/common.py. The manipulation of the argument X-Real-Ip results in improper access controls. The attack may be performed from remote. The exploit has been made public and could be used. The vendor confirms: "The reported X-Real-Ip IP-bypass vulnerability has already been fixed".
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Analysis
by VulDB Data Team • 10/20/2026
A critical security flaw has been identified within aaPanel, a popular open-source server management panel for Linux systems, specifically affecting versions up to 8.25.0. The vulnerability resides in the GetClientIp function located within the class/public/common.py file of the application's codebase. This component is responsible for determining the source IP address of incoming requests by parsing HTTP headers provided by reverse proxies or load balancers. Specifically, the system improperly handles the X-Real-Ip header without adequate validation or sanitization mechanisms. By manipulating this argument, an attacker can inject a forged IP address that the application accepts as legitimate, thereby bypassing access control lists and other security restrictions that rely on client identity verification.
The technical nature of this flaw constitutes an improper access control vulnerability where the system fails to properly validate input data before using it for security decisions. When aaPanel processes requests passing through intermediate network devices such as Nginx or Apache configured as reverse proxies, these devices often set the X-Real-Ip header to reflect the original client's address. However, if an attacker sends a direct request with a crafted X-Real-Ip header and no prior proxy is present, or if they exploit misconfigurations where trusted headers are not strictly enforced, the application will trust this spoofed value. This behavior allows malicious actors to impersonate authorized users or specific IP ranges that should be restricted from accessing sensitive administrative functions. The vulnerability aligns with CWE-287, which describes Improper Authentication, and more specifically relates to CWE-918 regarding Server-Side Request Forgery implications when combined with other vectors, though the primary classification remains an authentication bypass due to header manipulation.
The operational impact of this vulnerability is severe given the nature of aaPanel as a central management interface for web servers, databases, and file systems on Linux VPS environments. Since access controls are often configured based on IP whitelisting to restrict panel login to specific administrative networks, successfully exploiting this flaw allows an attacker to bypass these restrictions entirely. This means that even if an administrator has locked down the panel to a private or corporate IP range, an external attacker can spoof their source address in the HTTP headers to appear as though they are originating from within that trusted network. Consequently, unauthorized individuals could gain full administrative access to the server environment, leading to potential data exfiltration, malware installation, lateral movement across internal networks, and complete compromise of the underlying infrastructure. The fact that an exploit has been made public significantly increases the risk landscape, as automated scanning tools and opportunistic attackers can readily leverage this knowledge to target vulnerable instances on the internet.
This vulnerability is also relevant to MITRE ATT&CK framework techniques related to Initial Access and Privilege Escalation. Specifically, it maps to T1078 Valid Accounts if used in conjunction with stolen credentials, but more directly relates to bypassing authentication mechanisms which can facilitate unauthorized access without valid credentials. The ability to spoof IP addresses is a common technique observed in advanced persistent threats seeking to evade network-based detection systems that rely on source address analysis for threat intelligence and blocking rules.
To mitigate this risk, administrators must immediately upgrade aaPanel to version 8.25.1 or later where the vendor has confirmed the fix for the X-Real-Ip IP-bypass vulnerability is implemented. In addition to upgrading, it is crucial to review server configurations to ensure that reverse proxies are correctly configured to only set trusted headers from known upstream sources and not allow end-users to override them. Implementing strict input validation on all HTTP headers used for security decisions is a fundamental best practice in web application development. Furthermore, organizations should consider implementing additional layers of authentication such as two-factor authentication for the aaPanel interface to reduce reliance solely on IP-based access controls. Regular monitoring of server logs for anomalous login attempts from unexpected geographic locations or unusual header patterns can also help detect exploitation attempts early.