CVE-2026-82646 in AVideo
Summary
by MITRE • 08/30/2026
WWBN AVideo contains an unauthenticated reflected cross-site scripting vulnerability in the url2Embed.json.php endpoint that allows attackers to inject malicious scripts by supplying URLs with HTML metacharacters. Attackers can mint an encrypted evideo payload containing unescaped markup, then deliver it as a legitimate-looking link on the site's own domain to execute JavaScript in victims' sessions and steal cookies or CSRF tokens.
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Analysis
by VulDB Data Team • 08/30/2026
The vulnerability identified in WWBN AVideo represents a significant security flaw within its url2Embed.json.php endpoint, classified fundamentally as an unauthenticated reflected cross-site scripting (XSS) issue. This type of vulnerability arises when an application takes user-supplied input and includes it in the output sent to a web browser without proper validation or encoding. In this specific instance, the endpoint fails to adequately sanitize URLs that contain HTML metacharacters before processing them for embedding purposes. The lack of authentication required to exploit this flaw means that any external actor on the internet can initiate an attack vector without needing valid credentials, significantly lowering the barrier to entry for potential adversaries and increasing the likelihood of successful exploitation in unpatched environments.
From a technical perspective, the core defect lies in how the application handles URL parameters intended for embedding video content. When a user or attacker supplies a URL containing specific HTML characters, such as angle brackets or quotation marks, these characters are not properly escaped by the server-side logic before being reflected back to the client's browser. This allows an attacker to construct a malicious payload that includes JavaScript code embedded within what appears to be a legitimate video link structure. The application processes this input and returns it in a JSON response which is then rendered or executed by the victim's web browser, interpreting the injected script as part of the page content rather than mere data.
The operational impact of this vulnerability extends beyond simple defacement or alert boxes, primarily due to the ability to mint encrypted evideo payloads containing unescaped markup. By crafting a specially formatted URL that includes malicious JavaScript, an attacker can deliver this payload disguised as a normal video link on the site's own domain. Because the request originates from the same origin as the victim’s session cookies and tokens, it bypasses Same-Origin Policy protections. When a user clicks or is redirected to this crafted link while logged into AVideo, their browser executes the injected script within the context of that trusted domain. This enables the attacker to perform actions on behalf of the authenticated user, such as stealing sensitive session cookies, capturing CSRF tokens, or hijacking administrative sessions if the victim holds elevated privileges.
This attack vector aligns with CWE-79, which describes Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. The specific mechanism here reflects a failure to implement proper output encoding for data derived from user input before it is placed in an HTML context. Furthermore, the exploitation technique maps closely to MITRE ATT&CK techniques related to Client-side Injection and Session Hijacking. By leveraging the victim's active session against the application itself, the attacker effectively compromises the integrity of the web application’s trust model. The use of encrypted payloads adds a layer of obfuscation that may evade basic signature-based detection systems often deployed in Web Application Firewalls, making proactive input validation and output encoding critical defenses.
To mitigate this vulnerability, developers must implement strict input validation on all parameters passed to the url2Embed.json.php endpoint. This includes rejecting or sanitizing any HTML metacharacters that are not strictly necessary for URL functionality. More importantly, robust output encoding should be applied when rendering user-supplied data in JSON responses that may influence client-side behavior. Implementing Content Security Policy headers can also help mitigate the impact by restricting the sources from which scripts can be executed. Regular security audits and penetration testing focused on input handling and reflection points are essential to identify similar flaws across other endpoints within the AVideo platform, ensuring comprehensive protection against cross-site scripting attacks.