CVE-2026-20166 in Splunk
Summary
by MITRE • 03/11/2026
In Splunk Enterprise versions below 10.2.1 and 10.0.4, and Splunk Cloud Platform versions below 10.2.2510.5, 10.1.2507.16, and 10.0.2503.12, a low-privileged user that does not hold the "admin" or "power" Splunk roles could retrieve the Observability Cloud API access token through the Discover Splunk Observability Cloud app due to improper access control.
This vulnerability does not affect Splunk Enterprise versions below 9.4.9 and 9.3.10 because the Discover Splunk Observability Cloud app does not come with Splunk Enterprise.
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Analysis
by VulDB Data Team • 03/14/2026
This vulnerability exists within Splunk Enterprise and Splunk Cloud Platform installations where unauthorized users can exploit weak access controls to obtain sensitive Observability Cloud API credentials. The flaw specifically affects versions prior to 10.2.1 and 10.0.4 for Enterprise, and prior to 10.2.2510.5, 10.1.2507.16, and 10.0.2503.12 for Cloud Platform. The vulnerability stems from improper access control mechanisms within the Discover Splunk Observability Cloud application, which allows users without administrative or power roles to extract API tokens that should be restricted to privileged users only. This represents a significant security risk as API tokens typically provide extensive access to cloud resources and monitoring data.
The technical nature of this vulnerability aligns with CWE-284, which addresses improper access control issues in software applications. Attackers could leverage this weakness to escalate privileges and gain unauthorized access to Observability Cloud resources, potentially leading to data exfiltration, service disruption, or further lateral movement within the infrastructure. The vulnerability specifically impacts the Discover Splunk Observability Cloud app, which is not included in older Splunk Enterprise versions below 9.4.9 and 9.3.10, making those installations inherently more secure against this particular attack vector. This conditional exposure demonstrates how application-specific components can introduce unique security risks that differ from core platform vulnerabilities.
The operational impact of this vulnerability extends beyond simple credential theft, as Observability Cloud API tokens typically provide access to monitoring data, alerting systems, and infrastructure metrics that could be exploited for malicious purposes. Organizations using affected Splunk versions may experience unauthorized access to their cloud monitoring infrastructure, potentially leading to data breaches or service interruptions. The vulnerability affects both on-premises Splunk Enterprise deployments and cloud-based Splunk Cloud Platform installations, creating a broad attack surface that requires immediate attention from security teams. This type of access control flaw commonly maps to ATT&CK technique T1078.004, which covers valid accounts obtained through privilege escalation or unauthorized access to restricted resources.
Organizations should immediately upgrade to the patched versions of Splunk Enterprise and Splunk Cloud Platform to remediate this vulnerability. The recommended mitigation strategy involves implementing strict access controls for the Discover Splunk Observability Cloud application and monitoring for unauthorized access attempts. Security teams should also conduct comprehensive audits of user permissions and validate that only authorized personnel possess access to sensitive monitoring applications. Additionally, organizations should implement network segmentation and monitoring to detect potential exploitation attempts, as this vulnerability could enable attackers to maintain persistent access to cloud monitoring resources and potentially escalate their privileges further within the environment.