Stored XSS in Video Trailer URLs Bypasses Input Validation

WWBN AVideo through 29.2.0 contains a stored cross-site scripting vulnerability that allows users with upload permission to inject script by setting a malicious video trailer1 URL. The value is rendered unescaped in YouPHPFlix2 templates and channel playlists, letting attackers break out of onclick strings or iframe src attributes to execute JavaScript in victims' browsers.

Casky was already ahead

This CVE exploits attack patterns that Casky's 323matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

WWBN AVideo versions through 29.2.0 contain a stored cross-site scripting (XSS) vulnerability in video trailer URL handling. When users with upload permissions set a malicious trailer1 URL, the unsanitized input is rendered directly into YouPHPFlix2 templates and channel playlists without proper HTML escaping. This allows attackers to break out of HTML attribute contexts (onclick strings, iframe src attributes) and inject arbitrary JavaScript that executes in victims' browsers. Organizations running AVideo deployments are affected, particularly those managing user-generated content platforms or video sharing services. The stored nature of this vulnerability means the malicious payload persists and affects every user viewing the compromised video or playlist, making it a significant risk for widespread client-side compromise.

Casky's 323 matched skills leverage Claude AI's extended reasoning to detect the attack patterns mapped to Initial Access (TA0001) and Reconnaissance (TA0043) techniques. Practitioners using Casky would identify findings centered on CWE-79 violations where user-supplied trailer URLs bypass input sanitization routines. The platform's skill set would highlight dangerous patterns: unescaped variable rendering in templates, missing Content Security Policy headers, and insufficient output encoding in playlist generation logic. Casky would surface the specific attack chain—an authenticated user uploading content with crafted URLs that break HTML context boundaries—enabling security teams to recognize both the vulnerability signature and the reconnaissance/access methods attackers use to identify vulnerable AVideo instances in their infrastructure.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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323 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-105089.

Abuse of Public-Facing API: Mobile API Abuse

mobile security · low

Run

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

MITRE ATT&CK Techniques

TA0001 TA0043

Investigate the attack patterns behind CVE-2026-105089

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