CVE-2026-105060 in Logo Showcase Plugin
Summary
by MITRE • 10/05/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Themepoints Logo Showcase logo-showcase allows Stored XSS.This issue affects Logo Showcase: from n/a through 4.0.4.
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Analysis
by VulDB Data Team • 10/05/2026
The identified security flaw represents a classic instance of Improper Neutralization of Input During Web Page Generation, commonly known as Cross-Site Scripting or XSS. Specifically, this vulnerability manifests as a Stored XSS within the Themepoints Logo Showcase plugin for WordPress, affecting versions ranging from n/a through 4.0.4. Unlike reflected XSS attacks where malicious scripts are embedded in URLs and executed only when a victim clicks a specially crafted link, stored vulnerabilities persist on the target server. In this context, an attacker can inject malicious JavaScript code into the application's database or storage mechanisms via input fields managed by the Logo Showcase plugin. Once injected, this payload is not immediately executed but remains dormant until it is retrieved and rendered in a web page for other users. This persistence mechanism significantly amplifies the severity of the vulnerability because every user who views the affected content becomes a potential victim without any additional interaction required from them beyond normal browsing activities.
From a technical perspective, the root cause lies in the failure to properly sanitize or encode user-supplied input before it is included in HTML output. When administrators or users upload logos or configure showcase settings through the plugin's interface, the application accepts data that may contain executable script tags or event handlers such as onerror or onload attributes. The server-side processing logic fails to validate these inputs against a strict allowlist of safe characters or apply robust encoding techniques like HTML entity encoding before storing them in the database. Consequently, when the logo showcase page is generated for visitors, the browser interprets the stored malicious content as legitimate code and executes it within the context of the website's domain. This allows the attacker to bypass same-origin policy restrictions, enabling actions that are typically restricted to trusted scripts running on that specific site.
The operational impact of this vulnerability extends beyond simple defacement or annoyance. Because the script runs with the privileges of an authenticated user if they happen to view the compromised page, attackers can perform session hijacking by stealing cookies and authentication tokens. This capability allows them to impersonate legitimate users, potentially gaining unauthorized access to administrative panels or sensitive areas of the WordPress installation. Furthermore, stored XSS is frequently leveraged as a vector for drive-by downloads, where malicious scripts attempt to exploit browser vulnerabilities to install malware on the visitor's device. It also facilitates phishing attacks by dynamically modifying page content to display fake login forms that capture credentials. The widespread nature of this impact means that a single successful exploitation can compromise multiple users and potentially lead to full server takeover if combined with other privilege escalation techniques, thereby damaging the reputation of the website owner and exposing sensitive data to theft or manipulation.
In terms of industry classification standards, this vulnerability aligns directly with CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'). The specific variant is categorized under Stored XSS, which corresponds to ATT&CK technique T1059.007: JavaScript within the Enterprise Attack framework. This mapping highlights the tactical advantage gained by attackers who utilize this method for persistent access and data exfiltration. Security auditors should recognize that stored vulnerabilities often require more sophisticated defense-in-depth strategies compared to reflected ones, as they do not rely on social engineering tricks like lure clicks but rather exploit trust in the application's content delivery mechanism.
To mitigate this risk, immediate remediation is required by upgrading the Themepoints Logo Showcase plugin to a version later than 4.0.4 where the input validation and output encoding issues have been addressed. Developers must implement strict server-side input sanitization using libraries that adhere to OWASP guidelines for preventing XSS attacks. This involves ensuring that all user inputs are validated against expected formats, such as restricting logo uploads to specific image file types and sizes, while also applying context-sensitive output encoding when rendering data in HTML attributes or body content. Additionally, implementing Content Security Policy headers can provide a layer of defense by restricting the sources from which scripts can be loaded, thereby neutralizing many XSS payloads even if they are successfully injected into the database. Regular security audits and penetration testing should be conducted to verify that input handling mechanisms remain robust against evolving attack vectors.