Code Injection in PowerShell Universal Schedule Parameters

Improper control of generation of code ('Code Injection') in the schedule feature in Devolutions PowerShell Universal 2026.2.2 and earlier allows an authenticated user with schedule creation permission to execute arbitrary PowerShell code via crafted schedule parameter names concatenated into a script invocation.

Casky was already ahead

This CVE exploits attack patterns that Casky's 322matched 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-2026-16800 is a code injection vulnerability in Devolutions PowerShell Universal that allows authenticated users with schedule creation permissions to execute arbitrary PowerShell code. By crafting malicious schedule parameter names, attackers can inject code directly into script invocations, bypassing input validation controls. This vulnerability is particularly dangerous because it requires only basic authentication and schedule creation privileges—permissions commonly granted to system administrators, DevOps engineers, and automation specialists. Organizations relying on PowerShell Universal for infrastructure automation and task scheduling face significant risk of lateral movement, data exfiltration, and system compromise through this authenticated attack vector.

Casky's 322 mapped security skills detect the attack patterns behind this vulnerability by correlating MITRE ATT&CK techniques TA0001 (Initial Access) and TA0043 (Reconnaissance) with execution-layer anomalies. When Claude AI analyzes schedule creation events with extended reasoning, practitioners would see skill activations flagging: (1) suspicious parameter concatenation patterns that deviate from baseline schedule configurations, (2) indirect command execution attempts where user-supplied input flows unsanitized into PowerShell invocations, and (3) privilege context mismatches between the authenticated user's typical permissions and their schedule creation scope. Casky's findings would surface these code injection indicators in real-time, allowing security teams to identify exploitation attempts before arbitrary code execution occurs and to audit existing schedules for injected payloads.

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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 →

322 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-16800.

Abuse of Public-Facing API: Mobile API Abuse

mobile security · low

Run

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

MITRE ATT&CK Techniques

TA0001 TA0043

Investigate the attack patterns behind CVE-2026-16800

Casky has 322 skills that investigate the attack patterns behind CVE-2026-16800. Run one and get CVSS-scored findings in 3 minutes.

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