CVE-2025-29460 in MyBB
Summary
by MITRE • 04/18/2025
An issue in MyBB 1.8.38 allows a remote attacker to obtain sensitive information via the Add Mycode function.
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Analysis
by VulDB Data Team • 05/24/2025
The vulnerability identified as CVE-2025-29460 affects MyBB version 1.8.38 and represents a sensitive information disclosure flaw within the Add Mycode function. This type of vulnerability falls under the category of information exposure, where an attacker can gain unauthorized access to data that should remain confidential. The issue stems from inadequate input validation and output sanitization mechanisms within the MyBB codebase, specifically when processing user-supplied data through the Mycode functionality. MyBB is a widely-used open-source bulletin board system that enables communities to host discussions and manage user-generated content, making it a critical component for many online platforms. The Add Mycode function allows administrators and users to define custom formatting codes that can be used to enhance the presentation of posts and messages within the forum environment.
The technical implementation of this vulnerability involves the improper handling of user-provided data during the Mycode processing workflow. When users or administrators submit content through the Add Mycode interface, the system fails to adequately sanitize or validate the input parameters before they are processed or displayed. This weakness creates an opportunity for attackers to inject malicious payloads or manipulate the system's behavior to extract sensitive information from the server or database. The vulnerability could potentially expose configuration details, user credentials, database connection strings, or other confidential system information that should not be accessible to unauthorized parties. According to CWE classification, this vulnerability maps to CWE-200: Information Exposure, which encompasses various scenarios where sensitive data is unintentionally disclosed to unauthorized users. The attack vector is remote, meaning that an attacker does not need physical access to the system to exploit this vulnerability, and can potentially leverage it from anywhere on the internet.
The operational impact of CVE-2025-29460 extends beyond simple information disclosure, as the leaked data could enable more sophisticated attacks such as privilege escalation, credential theft, or further system compromise. An attacker who successfully exploits this vulnerability could potentially gain insights into the underlying system architecture, database schema, or administrative access patterns that would facilitate additional attacks. The exposure of sensitive information through this flaw could lead to unauthorized access to user accounts, data breaches, or complete system compromise. Organizations running MyBB 1.8.38 should consider this vulnerability as a critical security concern, particularly those hosting sensitive community forums or platforms that process confidential user information. The attack surface is significant given MyBB's widespread adoption across various online communities, making this vulnerability potentially exploitable at scale.
Mitigation strategies for this vulnerability should include immediate patching of the MyBB installation to the latest version that addresses this specific issue. System administrators should also implement network-level controls such as firewalls and intrusion detection systems to monitor for suspicious activity related to Mycode functionality. Additionally, input validation should be strengthened at multiple layers of the application to ensure that all user-supplied data is properly sanitized before processing. Security monitoring should be enhanced to detect unusual patterns in Mycode usage or attempts to access sensitive information through the forum interface. Organizations should also consider implementing web application firewalls to provide additional protection against exploitation attempts. The remediation process should include thorough testing to ensure that the patch does not introduce compatibility issues with existing forum functionality while maintaining the security posture of the system. According to ATT&CK framework, this vulnerability aligns with T1213: Data from Information Repositories and T1566: Phishing, as it enables attackers to harvest sensitive data that can be used for further malicious activities.