CVE-2026-76569 in Download Extension
Summary
by MITRE • 08/20/2026
Joomla Extension - phoca.cz - Reflected XSS via the search GET parameter in Phoca Download 5.0.0-6.1.4
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Analysis
by VulDB Data Team • 08/20/2026
The vulnerability identified in the Phoca Download extension for Joomla, affecting versions from 5.0.0 through 6.1.4, represents a classic instance of reflected Cross-Site Scripting within a widely used content management system ecosystem. This security flaw is located specifically within the search functionality exposed via the GET parameter associated with user queries. When an administrator or end-user inputs data into this field, the application fails to adequately sanitize or encode the provided input before reflecting it back in the HTTP response. Consequently, if malicious script code is embedded within the search query and submitted, the browser interprets and executes this code as part of the page content rather than treating it as inert text data. This behavior aligns directly with CWE-79, which defines Improper Neutralization of Input During Web Page Generation, commonly known as Cross-Site Scripting or XSS. The reflected nature of this vulnerability means that exploitation typically requires social engineering tactics to lure a victim into clicking a specially crafted URL containing the malicious payload.
From an operational perspective, the impact of this vulnerability extends beyond simple script execution. An attacker who successfully exploits this flaw can perform actions on behalf of the authenticated user if they are logged into the Joomla administration panel or any other session-dependent area protected by cookies that lack appropriate security flags such as HttpOnly or Secure attributes. This capability allows for account hijacking, where the attacker steals session tokens to gain unauthorized access to sensitive administrative functions. Furthermore, the vulnerability can be leveraged to deface websites by injecting malicious HTML content into public-facing pages, thereby damaging the reputation of the site owner and potentially spreading malware to visitors through drive-by download techniques or phishing pages that mimic legitimate login forms. The ATT&CK framework categorizes this type of attack under T1059, specifically within sub-techniques related to command and script interpreters like JavaScript execution in a browser context, highlighting its role as an initial access vector for broader system compromise.
The root cause lies in the insufficient validation mechanisms implemented by the extension developers during version 5.0.0 up to 6.1.4. The code likely retrieves the search term directly from the request parameters and inserts it into the HTML output without applying necessary encoding functions such as htmlspecialchars or equivalent sanitization routines that convert special characters like angle brackets, ampersands, and quotes into their safe entity equivalents. This oversight creates a direct path for script injection because modern web browsers will parse any valid JavaScript syntax found within unescaped text nodes. The persistence of this issue across multiple major versions indicates either a lack of rigorous security testing during the development lifecycle or an incomplete remediation effort in subsequent patches that failed to address all code paths where user input is reflected back to the client side.
Mitigation strategies for organizations utilizing Phoca Download must prioritize immediate patching if available from the official vendor repository, as updates typically include fixes for known vulnerabilities of this severity. In scenarios where updating is not immediately feasible due to compatibility constraints or deployment cycles, administrators should implement compensating controls at the web server level using Web Application Firewalls that can detect and block common XSS payloads based on signature-based detection rules. Additionally, enforcing strict Content Security Policy headers across all Joomla sites serves as a critical defense-in-depth measure by restricting the sources from which scripts can be loaded or executed, thereby neutralizing many reflected XSS attacks even if they bypass input validation filters. Regular security audits of third-party extensions are essential to identify similar flaws in other components that may share underlying architectural weaknesses regarding input handling and output encoding practices.