Stored XSS in AVideo YPTWallet Plugin Admin Interface

AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 contains a stored cross-site scripting vulnerability in the YPTWallet plugin where user-supplied CryptoWallet values are base64-encoded but not HTML-escaped before storage in wallet_log.information. Administrators viewing pending withdrawal requests in pendingRequests.php execute the stored markup in their session, allowing attackers to perform administrative actions via same-origin fetch requests.

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

CVE-2026-89249 is a stored cross-site scripting (XSS) vulnerability in the AVideo YPTWallet plugin that exploits improper output encoding of cryptocurrency wallet data. While user input is base64-encoded during storage, it is never HTML-escaped before rendering in the pendingRequests.php administrative interface. This means attackers can inject malicious JavaScript that executes in administrator sessions when they review pending withdrawal requests. The vulnerability is particularly dangerous because it targets privileged administrators who can authorize transactions, making it an ideal vector for lateral privilege abuse and unauthorized financial operations. Any organization running vulnerable versions of AVideo with the YPTWallet plugin enabled faces risk of administrative account compromise and potential financial fraud.

Casky's 323 matching skills detect this attack chain by mapping to MITRE ATT&CK techniques TA0001 (Initial Access) and TA0043 (Reconnaissance). Claude's extended reasoning analyzes CWE-79 patterns to identify how base64 encoding creates a false sense of sanitization—a common developer mistake where encoding is confused with escaping. Practitioners using Casky would see detection findings highlighting: (1) suspicious administrative requests originating from wallet management endpoints, (2) anomalous same-origin fetch requests to sensitive admin functions during withdrawal review workflows, (3) script injection patterns in cryptocurrency wallet fields that bypass single-layer encoding defenses, and (4) session hijacking indicators where admin actions occur without corresponding UI interactions. The skills framework connects these signals to reveal the full attack progression from payload injection through privileged action execution.

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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-2026-89249.

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

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