Improper Authentication in WebSocket Connection Handler

A vulnerability has been found in will-moss Isaiah up to 1.36.9. This affects an unknown function of the file app/main.go of the component Websocket Connection Authentication. The manipulation leads to improper authentication. The attack can be initiated remotely. The pull request to fix this issue awaits acceptance.

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-2026-15542 represents an improper authentication vulnerability in will-moss Isaiah's WebSocket connection handling, specifically within the app/main.go component. With a CVSS score of 7.3, this is a high-severity issue that allows remote attackers to bypass authentication mechanisms without requiring user interaction. Organizations running will-moss Isaiah versions up to 1.36.9 are affected, making this particularly critical for applications relying on WebSocket connections for real-time communication. The vulnerability's impact extends beyond simple access control—it can enable lateral movement, unauthorized data access, and potential command execution depending on what functionality the WebSocket serves.

Casky's 283 mapped skills leverage Claude AI's extended reasoning to detect the attack patterns associated with this vulnerability across MITRE ATT&CK techniques TA0004 (Privilege Escalation) and TA0006 (Credential Access). Practitioners using Casky would observe detection signals including: unauthenticated WebSocket connection attempts, failed or bypassed authentication handlers in app/main.go, suspicious token validation failures, and anomalous connection establishment without proper credential exchange. The platform's skill set would flag authentication decorator bypasses, missing or improperly implemented JWT/session validation in WebSocket upgrade requests, and patterns consistent with CWE-287 authentication weaknesses—enabling security teams to identify exploitation attempts and vulnerable configurations before attackers gain persistent access.

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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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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

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-2026-15542.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

identity access management · low

Run

MITRE ATT&CK Techniques

TA0004 TA0006

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