CVE-2026-76297 in Splunk
Summary
by MITRE • 10/22/2026
In Splunk Enterprise versions below 10.4.4, 10.2.8, 10.0.11, and 9.4.16, an unauthenticated user could trick a user that holds a role with the edit_federated_providers capability into turning off all federated search providers. Successful exploitation could temporarily prevent federated searches from retrieving data from remote datasets. The vulnerability is possible because the federated provider Representational State Transfer (REST) API accepts GET requests for actions that change provider state. The vulnerability requires the attacker to phish the affected user by tricking them into initiating a request within their browser. The unauthenticated user should not be able to exploit the vulnerability at will. For more information see Run federated searches over remote Splunk platform deployments (https://help.splunk.com/en/splunk-enterprise/search/federated-search/10.6/run-federated-searches-across-other-splunk-deployments/run-federated-searches-over-remote-splunk-platform-deployments) and Define roles on the Splunk platform with capabilities (https://help.splunk.com/en/splunk-enterprise/administer/manage-users-and-security/10.4/manage-splunk-platform-users-and-roles/define-roles-on-the-splunk-platform-with-capabilities) in the Splunk documentation.
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Analysis
by VulDB Data Team • 10/22/2026
The vulnerability identified in specific versions of Splunk Enterprise, including those below 10.4.4, 10.2.8, 10.0.11, and 9.4.16, represents a significant security flaw within the federated search functionality. This feature allows users to execute searches across multiple remote Splunk platform deployments, aggregating data from distributed sources into a single view. The core issue stems from an improper implementation of access controls on the Representational State Transfer (REST) API used for managing federated providers. Specifically, the API endpoint responsible for modifying provider state incorrectly accepts GET requests that trigger destructive actions rather than restricting such operations to appropriate HTTP methods like POST or PUT with strict authentication and authorization checks. This architectural oversight allows an unauthenticated actor to influence the configuration of security-sensitive components if they can manipulate a privileged user into initiating the request.
The technical mechanism behind this vulnerability relies on Cross-Site Request Forgery (CSRF) principles, although it is classified more broadly as an improper access control flaw due to the nature of the API endpoint's design. An attacker does not need valid credentials or direct network access to exploit this weakness directly; instead, they must engage in social engineering tactics such as phishing. By tricking a user who possesses the edit_federated_providers capability into clicking on a malicious link or visiting a compromised website, the attacker can cause that user's browser to send an unauthorized GET request to the Splunk server. Because the session cookie for the privileged user is automatically included in this request by the browser, the server interprets it as a legitimate action initiated by the authenticated administrator. This results in the disabling of all federated search providers without any further verification or confirmation from the system's security controls.
The operational impact of successfully exploiting this vulnerability is primarily related to availability and data integrity within the Splunk environment. When all federated search providers are turned off, the platform loses its ability to retrieve data from remote datasets. This effectively blindsides analysts who rely on aggregated views for threat hunting, incident response, or compliance reporting. While the vulnerability does not allow direct code execution or immediate unauthorized access to sensitive data stored locally, it severely degrades the functionality of a critical security tool. The inability to perform federated searches can delay detection and response times during active incidents, creating a window of opportunity for adversaries who may be operating within the environment undetected due to the lack of comprehensive visibility across distributed systems.
From a classification perspective, this vulnerability aligns with CWE-269, which denotes Improper Privilege Management, as it involves an actor obtaining capabilities beyond what is intended by their current authorization level through manipulation rather than direct privilege escalation. It also relates to CWE-352, Cross-Site Request Forgery, due to the reliance on tricking a user into performing actions via browser-based requests. In terms of MITRE ATT&CK framework mapping, this technique corresponds to T1078, Valid Accounts, specifically through social engineering tactics that leverage existing privileges rather than creating new ones. The attack vector is classified as Local or Remote depending on the phishing delivery mechanism, but it fundamentally relies on user interaction and trust in the interface's security boundaries.
Mitigation strategies must address both the technical flaw and the human element involved in its exploitation. Splunk has addressed this issue by releasing patched versions of Enterprise software that correct the REST API behavior to reject GET requests for state-changing actions or enforce stricter authentication checks regardless of HTTP method. Organizations running affected versions should immediately upgrade to one of the specified safe releases, such as 10.4.4, 10.2.8, 10.0.11, or 9.4.16. In addition to patching, administrators should review roles and capabilities assigned to users within the Splunk platform. The edit_federated_providers capability is powerful and should be granted only to a minimal number of trusted individuals who require it for their specific job functions. Implementing multi-factor authentication can also add an additional layer of security, although it may not directly prevent CSRF attacks unless specifically configured to challenge such requests.
Security awareness training remains critical in defending against this type of vulnerability. Since the exploitation requires phishing or social engineering, educating users about the risks of clicking unknown links and verifying the source of administrative tasks is essential. Furthermore, implementing Web Application Firewalls (WAFs) with rules that detect anomalous API usage patterns can provide an additional layer of defense by blocking requests that attempt to modify provider states via GET methods. Regular audits of role assignments and capability distributions help ensure that privilege creep does not expand the attack surface unnecessarily. By combining timely software updates, strict access control policies, and robust user education, organizations can effectively neutralize the risk posed by this vulnerability and maintain the integrity of their federated search capabilities.