CVE-2026-76347 Splunk CVE debrief

Who should care

Splunk Enterprise and Splunk Secure Gateway administrators, security teams, and users with non-admin roles should be aware of this vulnerability. These individuals are responsible for ensuring the security and integrity of their Splunk environments, including applying patches, monitoring for suspicious activity, and restricting user roles and permissions to prevent exploitation. Additionally, IT and network security teams may need to review and update their incident response plans to address potential exploitation of this vulnerability. Users with non-admin roles should also be cautious when using report notifications to avoid inadvertently triggering the vulnerability. Furthermore, organizations using affected versions should prioritize patching and consider implementing compensating controls to mitigate the risk of exploitation. Security teams should also monitor for indicators of compromise and be prepared to respond quickly in case of an attack. Lastly, developers and engineers involved in the development and maintenance of Splunk applications and integrations should be aware of the vulnerability and its potential impact on their work. They may need to review and update their code to ensure that it does not exacerbate the vulnerability or create new vulnerabilities. By taking these steps, organizations can reduce the risk of exploitation and minimize the potential impact of a successful attack. It is also recommended that organizations review their current user roles and permissions to ensure that they are properly configured and that users only have access to the resources and features they need to perform their jobs. This can help prevent exploitation of the vulnerability and reduce the risk of other types of attacks. Overall, a comprehensive approach to security and vulnerability management is essential to protecting against this and other types of threats. This includes staying informed about the latest vulnerabilities and threats, implementing effective security controls, and having incident response plans in place to quickly respond to and contain attacks. By prioritizing security and taking proactive steps to protect their environments, organizations,

Technical summary

The vulnerability is caused by Splunk Secure Gateway not validating report notification path values before sending internal requests, allowing users without admin or power roles to exploit SSRF and potentially alter Search Head Cluster state and cause denial of service. This issue arises from inadequate input validation and sanitization within the Splunk Secure Gateway, which fails to properly restrict the paths that can be accessed through report notifications.

Defensive priority

Medium priority due to potential impact on Search Head Cluster state and service availability.

Recommended defensive actions

• Inventory and verify affected Splunk Enterprise and Splunk Secure Gateway versions.
• Apply vendor patches or updates to vulnerable versions.
• Implement compensating controls to monitor and restrict internal service requests.
• Review and restrict user roles and permissions to prevent exploitation.
• Monitor for indicators of compromise and be prepared to respond quickly in case of an attack.
• Review and update incident response plans to address potential exploitation of this vulnerability.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The vulnerability exists 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. Limited information available on affected scope and vendor remediation efforts. Further verification is needed to determine the full extent of the vulnerability and to confirm the effectiveness of proposed mitigations.

Official resources