Authentication Bypass via Unverified Video Hash Credentials

AVideo through commit 9c39d8c8 contains an authentication bypass vulnerability where deduplicateByEncoderQueueId() returns video_id_hash credentials for any video by encoder_queue_id without ownership verification, and useVideoHashOrLogin() converts this hash into passwordless login as the video owner. Attackers with upload permission can retrieve an administrator's video_id_hash by omitting the videos_id parameter, then use that hash in an unauthenticated request to gain administrative session access and modify system configuration.

Casky was already ahead

This CVE exploits attack patterns that Casky's 283matched 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-2026-59808 is a critical authentication bypass vulnerability in AVideo that allows attackers to escalate privileges from upload permissions to administrative access. The flaw exists in the deduplicateByEncoderQueueId() function, which returns video_id_hash credentials without verifying ownership, combined with useVideoHashOrLogin() that converts this hash into passwordless authentication. Any authenticated user with upload permissions can exploit this to retrieve an administrator's video hash and impersonate them without knowing their actual credentials. This affects AVideo deployments through commit 9c39d8c8 and impacts organizations relying on role-based access controls, as the vulnerability completely bypasses authentication mechanisms.

Casky's 283 matching skills leverage Claude's extended reasoning to detect the adversarial techniques underlying this attack across MITRE ATT&CK Privilege Escalation (TA0004) and Credential Access (TA0006) tactics. Practitioners using Casky would identify CWE-306 (Missing Authentication Check) patterns through behavioral analysis of authentication requests lacking proper ownership verification, suspicious hash-to-session conversions without credential validation, and lateral privilege escalation from upload to administrative roles. The platform's skills would flag anomalous sequences such as encoder_queue_id queries returning sensitive hashes, followed by authentication attempts using those credentials, revealing the attack chain that transforms a legitimate upload permission into full administrative compromise.

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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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283 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-59808.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

cryptography · low

Run

MITRE ATT&CK Techniques

TA0004 TA0006

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