ArcadeDB Async Command Authentication Bypass

ArcadeDB server (com.arcadedb:arcadedb-server) in versions 26.7.3 and earlier fails to propagate the authenticated principal to asynchronous command worker threads. When an HTTP command is submitted with awaitResponse:false, it executes on an async worker whose DatabaseContext has no bound user, causing the scripting authorization gate to become a no-op. A user with only read access to a single database can submit an asynchronous JavaScript (language=js) command via the /api/v1/command endpoint to run code with unrestricted host access (e.g., database.getSecurity().createUser) and create a server-wide administrator, escalating to full administrative control. Fixed in 26.8.1.

Casky was already ahead

This CVE exploits attack patterns that Casky's 224matched 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

ArcadeDB server versions 26.7.3 and earlier contain a critical authentication bypass vulnerability in their asynchronous command processing. When HTTP commands are submitted with awaitResponse:false, they execute on worker threads that lack proper user context propagation, rendering authorization checks ineffective. This allows attackers with minimal read-only database access to execute arbitrary JavaScript commands with elevated privileges, completely circumventing the intended security model. The vulnerability affects any organization running vulnerable ArcadeDB instances, particularly those relying on role-based access controls to segment database permissions.

Casky's 224 matched security skills leverage Claude's extended reasoning to detect the attack patterns associated with this vulnerability by analyzing TA0004 (Privilege Escalation) techniques. Practitioners using Casky would identify suspicious indicators including: HTTP requests to /api/v1/command endpoints with awaitResponse:false parameters, JavaScript code execution (language=js) from low-privileged accounts, DatabaseContext objects initialized without authenticated principals in async threads, and authorization bypass attempts where read-only users execute commands exceeding their permissions. The platform's skill mapping would correlate these behavioral anomalies with MITRE ATT&CK techniques, revealing the privilege escalation chain and helping security teams distinguish between legitimate asynchronous operations and exploitation attempts targeting authentication propagation gaps.

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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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224 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-75851.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

penetration testing · medium

Run

MITRE ATT&CK Techniques

TA0004

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