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CVE-2026-20163 is a remote command execution vulnerability in Splunk Enterprise and Splunk Cloud Platform caused by insufficient neutralization of user-controlled input in the upload preview workflow prior to indexing. The vulnerable functionality resides in the REST API endpoint used for indexing preview, where the unarchive_cmd parameter can be influenced by an authenticated user whose role includes the high-privilege edit_cmd capability. Because the parameter is not properly sanitized before being passed to shell-interpreted functionality, an attacker can inject arbitrary shell commands and cause them to execute on the underlying host operating system. Affected versions include Splunk Enterprise releases prior to 10.2.0, 10.0.4, 9.4.9, and 9.3.10, and Splunk Cloud Platform releases prior to 10.2.2510.5, 10.1.2507.16, 10.0.2503.12, and 9.3.2411.124.
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edit_cmd capability from all roles that do not strictly require it. Restrict access to the affected upload preview functionality to the smallest possible set of trusted administrative users and review role assignments for unnecessary high-privilege capabilities. Because no specific detection signatures are noted as available, compensating controls should focus on privilege reduction and rapid patch deployment.Patch, then assume compromise.
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A prior Splunk command injection vulnerability on the /splunkd/__upload/indexing/preview endpoint, referenced as a parallel example sharing the same CWE-78 weakness.
A closely related Splunk Enterprise and Cloud Platform remote code execution vulnerability using the same jsonpickle/KV Store deserialization mechanism, but requiring admin-level privileges and confirmed exploited in the wild.
A high-severity remote command execution vulnerability in Splunk Enterprise and Splunk Cloud Platform caused by improper sanitization of user-controlled input (CWE-77) in the file upload preview/indexing REST API endpoint, enabling arbitrary shell command execution when a user has the high-privilege edit_cmd capability.
A remote command execution vulnerability in Splunk Enterprise and Splunk Cloud Platform caused by insufficient input sanitization in the upload preview interface's unarchive option, allowing arbitrary shell commands on the host OS.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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