OpenShell Mirror Mode Allows Arbitrary Code Execution
The National Vulnerability Database has identified CVE-2026-41355 in OpenShell versions prior to 2026.3.28. This vulnerability, rated HIGH (CVSS 7.3), allows for arbitrary code execution within the mirror mode functionality. Specifically, untrusted sandbox files can be converted into workspace hooks.
Attackers with existing mirror mode access can exploit this by leveraging enabled workspace hooks. This enables them to execute arbitrary code directly on the host system during gateway startup. The vulnerability is categorized under CWE-829, indicating an improper neutralization of absolute path in a tarball entry.
For defenders, this is a critical remote code execution vector. The attacker’s calculus here is clear: gain initial access, then use this flaw to escalate privileges or establish persistence. It’s a low-complexity attack requiring only basic user privileges and user interaction, making it highly attractive for adversaries.
What This Means For You
- If your organization utilizes OpenShell, you need to immediately identify all instances running versions prior to 2026.3.28. Prioritize patching to the latest secure version. Furthermore, audit your systems for any enabled workspace hooks or unusual activity in mirror mode, as this could indicate a compromise or attempted exploitation.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-41355: OpenShell Mirror Mode Arbitrary Code Execution via Workspace Hook
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-41355 | RCE | OpenShell before 2026.3.28 |
| CVE-2026-41355 | RCE | arbitrary code execution in mirror mode |
| CVE-2026-41355 | RCE | converts untrusted sandbox files into workspace hooks |
| CVE-2026-41355 | RCE | exploitation of enabled workspace hooks during gateway startup |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 24, 2026 at 01:16 UTC |
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