Synology Assistant Incorrect Default Permissions Vulnerability

An incorrect default permissions vulnerability in Synology Assistant before 7.0.7-50095 allows local users to read or write arbitrary files and conduct denial-of-service during installation.

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

CVE-2026-4793 represents a privilege escalation and file access vulnerability stemming from incorrect default permissions in Synology Assistant versions before 7.0.7-50095. During installation, the application fails to properly restrict file system permissions, enabling local users to read sensitive files, modify critical system components, or execute denial-of-service attacks. This vulnerability is particularly significant for organizations deploying Synology backup and recovery solutions across their infrastructure, as it provides a foothold for lateral movement and data exfiltration without requiring elevated privileges beforehand.

Casky's 224 mapped skills leverage Claude AI's extended reasoning to detect attack patterns associated with MITRE technique TA0004 (Privilege Escalation). Practitioners using Casky would observe detection logic flagging suspicious file permission changes during Synology Assistant installation, unauthorized file access attempts targeting installation directories, and process behavior indicative of privilege abuse. The platform correlates permission misconfiguration indicators with access patterns, enabling security teams to identify exploitation attempts before attackers establish persistent access. By mapping this vulnerability against the broader ATT&CK framework, Casky helps practitioners understand not just the immediate CVE risk, but the post-exploitation techniques an attacker might chain together following successful privilege escalation.

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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 →

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-2026-4793.

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

Investigate the attack patterns behind CVE-2026-4793

Casky has 224 skills that investigate the attack patterns behind CVE-2026-4793. Run one and get CVSS-scored findings in 3 minutes.

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