CVE-2026-76347 in Splunk
Summary
by MITRE • 08/19/2026
In Splunk Enterprise versions below 10.4.2, 10.2.6, 10.0.9, and 9.4.14, and Splunk Secure Gateway versions below 3.10.9, 3.9.23, and 3.8.70, a user who does not hold the "admin" or "power" Splunk roles could use Server-Side Request Forgery (SSRF) in report notifications to send system-authenticated requests to internal Splunk services, which could allow for changes to Search Head Cluster state and a denial of service. The vulnerability is possible because Splunk Secure Gateway does not validate report notification path values before it sends internal requests.
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Analysis
by VulDB Data Team • 08/20/2026
A critical Server-Side Request Forgery (SSRF) vulnerability exists within specific versions of Splunk Enterprise and Splunk Secure Gateway, affecting users who lack administrative or power-level privileges. The flaw is present in Splunk Enterprise versions prior to 10.4.2, 10.2.6, 10.0.9, and 9.4.14, as well as in Splunk Secure Gateway versions below 3.10.9, 3.9.23, and 3.8.70. This vulnerability arises from a failure to properly validate input data within the report notification configuration mechanism. Specifically, when an authenticated user configures a report notification, the system does not sufficiently sanitize or verify the destination path values before processing them for internal service communication.
The technical core of this issue lies in how Splunk Secure Gateway handles requests initiated through the report notification feature. Because the gateway fails to validate these paths against a strict allowlist or enforce proper access controls on internal endpoints, it allows any authenticated user to craft malicious payloads that direct system-authenticated requests toward sensitive internal Splunk services. This bypasses standard authorization checks because the request is processed as if it originated from an authorized service account rather than the end-user initiating the notification setup. Consequently, attackers can leverage this misconfiguration to interact with backend components that are typically inaccessible to non-privileged users.
The operational impact of exploiting this SSRF vulnerability is significant and multifaceted. An attacker could manipulate the state of a Search Head Cluster by sending unauthorized commands or configuration changes through the internal API endpoints exposed via the vulnerable notification path. This capability allows for potential disruption of search operations, data indexing integrity, and overall cluster stability. Furthermore, the ability to send arbitrary requests to internal services can be leveraged to trigger resource exhaustion conditions, leading to a denial of service that affects the availability of Splunk services for legitimate users. The vulnerability effectively elevates the impact of low-privilege accounts by granting them indirect control over critical infrastructure components.
From a classification perspective, this flaw aligns with CWE-918, which describes Server-Side Request Forgery (SSRF) flaws where a web application fetches a remote resource without validating the user-supplied URL. Additionally, it relates to CWE-20, Improper Input Validation, as the root cause is the failure to sanitize input data before processing. In terms of adversary tactics, this vulnerability facilitates techniques associated with MITRE ATT&CK T1598, specifically Phishing for Information or Exploitation of Remote Services, by allowing an attacker to pivot through trusted internal connections that would otherwise be blocked. It also touches upon privilege escalation concepts found in CWE-269 due to the bypassing of intended access controls on sensitive system resources.
To mitigate this risk, organizations must immediately apply the latest security patches for Splunk Enterprise and Splunk Secure Gateway as specified by the vendor's release notes. Upgrading to Splunk Enterprise version 10.4.2 or later, 10.2.6 or later, 10.0.9 or later, or 9.4.14 or later is essential for resolving this issue in enterprise deployments. Similarly, administrators running Splunk Secure Gateway must upgrade to version 3.10.9, 3.9.23, or 3.8.70 and above. Until patches are applied, organizations should consider implementing network-level controls such as firewall rules that restrict outbound connections from the Splunk infrastructure to internal management interfaces unless explicitly required for business operations. Additionally, enforcing strict role-based access control policies ensures that only highly trusted users can configure report notifications, thereby reducing the attack surface available to lower-privileged accounts attempting to exploit this SSRF vector.