CVE-2026-76284 in Splunk
Summary
by MITRE • 10/08/2026
Improper Neutralization. Splunk addressed multiple internally identified vulnerabilities in Splunk Enterprise versions 10.4.3, 10.2.7, 10.0.10, and 9.4.15. The vulnerabilities are grouped by Common Weakness Enumeration (CWE), with one Common Vulnerabilities and Exposures (CVE) identifier assigned to each group. See Details for more information.
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Analysis
by VulDB Data Team • 10/08/2026
Splunk Enterprise versions 10.4.3, 10.2.7, 10.0.10, and 9.4.15 addressed a cluster of vulnerabilities categorized under the Common Weakness Enumeration identifier CWE-78, which denotes Improper Neutralization of Special Elements used in an OS Command, commonly known as OS command injection. This class of vulnerability arises when software constructs operating system commands using externally influenced input without sufficiently verifying or neutralizing special elements that could alter the intended command structure. In the context of Splunk Enterprise, these flaws likely existed within components responsible for processing user-supplied data to generate shell commands or interact with underlying operating system utilities. The failure to properly sanitize inputs allows an attacker to inject malicious payloads into legitimate commands, thereby gaining unauthorized control over the host environment where the vulnerable application is running.
The operational impact of such command injection vulnerabilities in a security information and event management platform like Splunk can be severe due to the high privileges typically required for its operation. If exploited successfully, these flaws could allow an authenticated attacker with access to specific interfaces or APIs within Splunk Enterprise to execute arbitrary commands on the underlying operating system. This capability effectively bypasses application-level controls and grants the attacker a foothold at the OS level. Depending on the configuration of the Splunk service account, this could lead to full compromise of the server, including the ability to read sensitive log data, modify configurations, install malware, or pivot further into the internal network. The grouping of multiple CVEs under a single CWE category suggests that these vulnerabilities may share common root causes in input validation logic across different modules or endpoints within the Splunk application stack.
From an offensive security perspective, this vulnerability aligns with techniques found in the MITRE ATT&CK framework, specifically T1059 Command and Scripting Interpreter, which covers execution of commands via operating system utilities such as cmd.exe on Windows or /bin/sh on Unix-like systems. Attackers leveraging these flaws would likely use standard command injection patterns to chain multiple operations together using separators like semicolons or ampersands, depending on the target OS. The presence of multiple related vulnerabilities indicates a systemic issue in how input data is handled across various features of the platform rather than an isolated incident in a single function. This pattern often points to insufficient parameterization and reliance on string concatenation for command construction instead of using safe APIs that separate code from data.
Mitigation strategies primarily involve applying the vendor-provided patches included in Splunk Enterprise versions 10.4.3, 10.2.7, 10.0.10, and 9.4.15 immediately to affected instances. Organizations should prioritize patching based on exposure levels, focusing first on systems that are internet-facing or accessible by untrusted networks. In addition to updating software, administrators should enforce strict input validation at the application layer for any custom scripts or integrations interacting with Splunk APIs. Implementing least privilege principles is critical; ensuring that the Splunk service runs under a restricted user account limits the potential damage if command injection occurs. Furthermore, deploying web application firewalls can provide an additional layer of defense by detecting and blocking common command injection payloads before they reach the vulnerable application logic. Regular security assessments and code reviews focusing on CWE-78 patterns are recommended to prevent recurrence in custom development or configuration scripts associated with the platform.