CVE-2010-4522

Vulnerability

Multiple cross-site scripting (XSS) vulnerabilities exist in MyBB versions 1.4.14 and 1.6.x prior to 1.6.1. The flaws are present in the editpost.php, member.php, and newreply.php scripts, where user-supplied input is not properly sanitized before being reflected in output [1]. This allows an attacker to inject arbitrary HTML or JavaScript.

Exploitation

An attacker can exploit these vulnerabilities by crafting a malicious URL or form submission that includes script code in parameters processed by the affected scripts. No authentication is required; the attacker only needs to trick a victim into visiting the crafted link or submitting the form. The injected script executes in the victim's browser within the context of the MyBB application.

Impact

Successful exploitation enables an attacker to execute arbitrary web script or HTML in the victim's browser. This can lead to session hijacking, defacement of forum content, theft of sensitive information, or other actions performed as the victim user.

Mitigation

MyBB released version 1.6.1 on December 15, 2010, which fixes these vulnerabilities [1]. Users running MyBB 1.4.14 can apply a security patch provided in the same announcement. All users are advised to upgrade to the latest patched version. No workarounds are documented.