CVE-2026-78073 in All Video Share Extension
Summary
by MITRE • 08/28/2026
Joomla Extension - mrvinoth.com - Reflected XSS in All Video Share 1.0.0-4.5.0 - Various user supplied inputs lacked escaping, leading to reflected XSS vectors
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Analysis
by VulDB Data Team • 08/28/2026
The vulnerability identified within the Joomla extension known as All Video Share, specifically affecting versions ranging from 1.0.0 through 4.5.0 hosted on mrvinoth.com, represents a classic instance of Reflected Cross-Site Scripting (XSS). This security flaw stems directly from inadequate input validation and sanitization mechanisms within the application's codebase. When user-supplied data is processed by the extension without proper escaping or encoding before being rendered back to the client browser, it creates an avenue for malicious actors to inject executable scripts into web pages viewed by other users. The reflection aspect of this vulnerability implies that the injected payload is immediately returned in the HTTP response rather than being stored on the server, meaning exploitation typically requires social engineering tactics such as crafting a deceptive link or embedding the script within a third-party site to lure victims into triggering the attack vector.
From a technical perspective, the root cause lies in the failure of the application to distinguish between data and code during the rendering process. In web applications built on frameworks like Joomla, it is imperative that all dynamic content derived from user inputs be treated as untrusted until explicitly validated or encoded. The All Video Share extension failed to implement these necessary safeguards across various input fields, allowing special characters such as angle brackets, quotes, and ampersands to pass through the processing pipeline unchanged. Consequently, when a victim interacts with a manipulated URL parameter or form submission containing malicious JavaScript code, the browser interprets this content not merely as text but as executable script within the context of the vulnerable website's domain. This behavior violates fundamental web security principles regarding output encoding and contextual escaping.
The operational impact of this vulnerability is significant due to its potential for session hijacking, credential theft, and defacement. An attacker leveraging this reflected XSS flaw can execute arbitrary JavaScript in the victim’s browser with the same privileges as legitimate scripts loaded by the site. This capability allows the extraction of sensitive information such as session cookies, authentication tokens, or personally identifiable data stored locally within the user's environment. Furthermore, attackers may utilize the compromised context to perform actions on behalf of the authenticated user without their knowledge, potentially leading to unauthorized modifications of content, redirection to phishing sites, or further propagation of malware through drive-by downloads if combined with other vulnerabilities in browser plugins or extensions. The trust relationship between the user and the Joomla site is effectively broken, undermining the integrity and confidentiality assurances provided by standard web security models.
This vulnerability aligns closely with Common Weakness Enumeration (CWE) identifiers such as CWE-79, which describes Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. Additionally, in terms of tactical mapping within the MITRE ATT&CK framework for enterprise cybersecurity, this flaw facilitates techniques associated with Collection via Browser Redirects or Client-Side Injection, where attackers exploit client-side resources to gather information from victims. The lack of robust input handling also points toward CWE-20, which refers to Improper Input Validation, indicating that the application did not adequately verify the format, type, length, range, and syntax of user-supplied data before processing it.
To mitigate this vulnerability, immediate remediation steps must focus on implementing strict output encoding for all dynamic content rendered in HTML contexts. Developers should utilize established libraries or framework-specific functions designed to escape special characters appropriately based on the context in which they are being displayed, whether that be within an HTML body, a JavaScript string, or an attribute value. Input validation should also be strengthened by enforcing whitelists of acceptable characters and rejecting any input containing potentially dangerous patterns such as script tags or event handlers before it is processed further. Upgrading to patched versions of the All Video Share extension where these issues have been resolved is critical for existing deployments. Additionally, implementing Content Security Policy (CSP) headers can provide an additional layer of defense by restricting the sources from which scripts are allowed to execute, thereby mitigating the impact even if a reflection vector remains exploitable in legacy systems that cannot be immediately patched.