Privilege Escalation via Arc Sensor CLI Synchronization

An Incorrect Privilege Assignment vulnerability was discovered in the synchronization functionality due to Arc sensors receiving CLI permissions. An authenticated user with limited privileges can push administrative CLI commands through the sync, altering the device configuration, and/or affecting its availability.

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-2026-33390 represents a critical privilege assignment flaw where Arc sensors incorrectly receive CLI permissions during synchronization operations. This vulnerability allows authenticated users with limited privileges to escalate their access by injecting administrative commands through the sync mechanism, potentially altering device configurations and disrupting service availability. Organizations deploying Arc sensor infrastructure are at risk, particularly those relying on role-based access controls to segregate administrative and standard user capabilities. The 8.1 CVSS score reflects the combination of high integrity and availability impact paired with the relatively low barrier to exploitation—a low-privilege authenticated user is sufficient to trigger the attack.

Casky's 224 mapped security skills leverage Claude AI's extended reasoning to detect the privilege escalation patterns inherent in TA0004 (Privilege Escalation) attacks. Practitioners using Casky would observe findings flagging unauthorized privilege elevation attempts during sync operations, identification of CLI command injection payloads in synchronization logs, detection of mismatched privilege levels between user roles and assigned permissions in Arc sensor configurations, and anomalous device configuration changes originating from low-privileged accounts. The platform's skills would correlate CWE-266 (Incorrect Privilege Assignment) indicators across Arc sensor communications, highlighting deviations from expected privilege boundaries and surfacing the specific synchronization vectors where administrative commands leak through limited-user accounts—enabling teams to remediate access control failures before exploitation occurs.

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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-2026-33390.

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-2026-33390

Casky has 224 skills that investigate the attack patterns behind CVE-2026-33390. Run one and get CVSS-scored findings in 3 minutes.

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