CVE-2026-76330 in Splunk
Summary
by MITRE • 08/20/2026
In Splunk Enterprise versions below 10.4.2, 10.2.6, 10.0.9, and 9.4.14, an unauthenticated user could trick an authenticated user into opening a crafted link to Monitoring Console. When the authenticated user opens the link, Splunk Enterprise runs attacker-controlled Search Processing Language (SPL) using the permissions of that user. The injected SPL could access data and perform actions available to that user. The vulnerability is possible because Monitoring Console does not sufficiently validate data used to build forwarder dashboard searches. The vulnerability requires the attacker to phish the user by tricking them into opening the crafted link. The unauthenticated user should not be able to exploit the vulnerability at will.
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Analysis
by VulDB Data Team • 08/20/2026
The identified security flaw resides within Splunk Enterprise versions prior to 10.4.2, 10.2.6, 10.0.9, and 9.4.14, specifically affecting the Monitoring Console component. This vulnerability represents a critical failure in input validation where the application fails to adequately sanitize or validate data utilized during the construction of forwarder dashboard searches. The core technical deficiency lies in the insufficient processing of user-supplied inputs that are subsequently embedded into Search Processing Language (SPL) queries. Because SPL is a powerful query language capable of accessing sensitive indexed data and executing administrative actions, any injection point within this context poses a severe risk to system integrity and confidentiality.
The operational mechanism of this exploit relies heavily on social engineering rather than direct automated exploitation. An unauthenticated attacker cannot directly trigger the vulnerability through network requests alone. Instead, the attack vector requires the adversary to craft a malicious URL designed to trick an authenticated user into opening it within their Splunk Enterprise session. This technique aligns with Common Weakness Enumeration (CWE) category CWE-20 Improper Input Validation and is often categorized under CWE-79 Cross-site Scripting if the payload results in client-side execution, or more accurately as a form of Server-Side Request Forgery or Command Injection depending on how the SPL is interpreted by the backend engine. In the context of ATT&CK framework, this behavior maps to T1059 Command and Scripting Interpreter via Splunk Search Processing Language, allowing for potential data exfiltration or lateral movement if the compromised user has elevated privileges.
Once an authenticated victim opens the crafted link, the Monitoring Console processes the embedded parameters without sufficient scrutiny, resulting in the execution of attacker-controlled SPL commands under the context of that specific user account. This means the injected code inherits all permissions associated with the targeted session. The consequences can range from unauthorized access to sensitive log data and metrics stored within Splunk indexes to performing destructive actions such as deleting events or modifying configurations if the user possesses administrative rights. Since Splunk often serves as a central repository for organizational security telemetry, compromising it allows an attacker to potentially cover their tracks by manipulating audit logs or exfiltrating critical infrastructure intelligence.
Mitigation strategies must prioritize immediate patching of all affected Splunk Enterprise instances to versions 10.4.2, 10.2.6, 10.0.9, and 9.4.14 or later where these validation checks have been strengthened. In environments where immediate patching is not feasible, administrators should implement strict access controls on the Monitoring Console interface to limit exposure to trusted personnel only. Additionally, deploying web application firewalls with rules capable of detecting anomalous SPL syntax patterns in URL parameters can provide a layer of defense against exploitation attempts. Security awareness training for users is also critical to reduce the success rate of phishing campaigns aimed at tricking employees into interacting with malicious links targeting Splunk interfaces.