CVE-2012-5104 in UBB.threads
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in forums/ubbthreads.php in UBB.threads 7.5.6 and earlier allows remote attackers to inject arbitrary web script or HTML via the Loginname parameter.
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Analysis
by VulDB Data Team • 05/14/2025
The CVE-2012-5104 vulnerability represents a critical cross-site scripting flaw in UBB.threads version 7.5.6 and earlier, specifically affecting the forums/ubbthreads.php component. This vulnerability resides within the web application's input validation mechanisms, where user-supplied data is not properly sanitized before being rendered back to users. The Loginname parameter serves as the primary attack vector, allowing malicious actors to inject arbitrary web scripts or HTML code that executes in the context of other users' browsers. The vulnerability stems from inadequate output encoding and input validation practices, creating an environment where malicious payloads can persist and propagate through the forum's user interface.
This XSS vulnerability operates under the Common Weakness Enumeration CWE-79 classification, which specifically addresses Cross-Site Scripting vulnerabilities in web applications. The flaw enables attackers to execute malicious scripts in the victim's browser context, potentially leading to session hijacking, credential theft, or redirection to malicious sites. The vulnerability is particularly dangerous because it affects a core authentication parameter, meaning that any user attempting to log in or register with malicious input could inadvertently trigger the exploit. The attack requires no special privileges and can be executed through simple HTTP requests, making it highly accessible to both skilled and less experienced attackers.
The operational impact of CVE-2012-5104 extends beyond simple script execution, as it can facilitate more sophisticated attacks within the context of the compromised forum environment. Attackers could leverage this vulnerability to steal session cookies, modify user permissions, or inject malicious content that propagates to other forum users. The vulnerability also aligns with ATT&CK technique T1566.001, which involves the exploitation of web application vulnerabilities to gain initial access or escalate privileges within a target environment. The affected UBB.threads platform becomes a potential command and control channel where attackers can establish persistent access to forum users and potentially use the compromised system to target other systems within the network.
Mitigation strategies for CVE-2012-5104 must address both immediate remediation and long-term architectural improvements. The most effective immediate solution involves implementing proper input validation and output encoding mechanisms, specifically ensuring that all user-supplied data passed through the Loginname parameter undergoes strict sanitization before being processed or displayed. Organizations should implement Content Security Policy headers to limit the execution of inline scripts and restrict external resource loading. Additionally, the platform should be upgraded to a supported version of UBB.threads that includes proper XSS protection mechanisms and regular security patches. The vulnerability also underscores the importance of regular security assessments and input validation testing, as outlined in OWASP Top Ten security practices, particularly focusing on the prevention of injection flaws that could lead to XSS attacks.