CVE-2026-76312 in Splunk
Summary
by MITRE • 08/20/2026
In Splunk Enterprise versions below 10.4.1, 10.2.6, 10.0.9, and 9.4.14, an unauthenticated user who can read the Hypertext Markup Language (HTML) source of a page that embeds a Splunk report could use exposed session material to access all relevant data and affect system integrity. The vulnerability is possible because the dispatch archive download path does not correctly enforce the embedded-report authorization boundary and includes sensitive session material in archived search-job data. For more information see Additional configuration for embedded reports (https://help.splunk.com/en/splunk-enterprise/create-dashboards-and-reports/reporting-manual/10.4/report-management/additional-configuration-for-embedded-reports) and Embed scheduled reports (https://help.splunk.com/en/splunk-enterprise/create-dashboards-and-reports/reporting-manual/10.4/report-management/embed-scheduled-reports) in the Splunk documentation.
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Analysis
by VulDB Data Team • 08/20/2026
The vulnerability identified in specific versions of Splunk Enterprise, including releases prior to 10.4.1, 10.2.6, 10.0.9, and 9.4.14, represents a critical failure in access control mechanisms related to embedded reports and search job archives. This flaw allows an unauthenticated user who possesses the ability to view the Hypertext Markup Language source code of any page embedding a Splunk report to exploit exposed session material for unauthorized data access. The core technical issue stems from the dispatch archive download path, which fails to correctly enforce the authorization boundaries established for embedded reports. Consequently, sensitive session tokens and authentication credentials are inadvertently included within archived search-job data files that can be downloaded by users with minimal privileges. This misconfiguration effectively bypasses the intended security controls designed to restrict access to specific datasets based on user roles or permissions.
From a technical perspective, this vulnerability is classified under CWE-284 Improper Access Control and CWE-598 Use of GET Request Method With Sensitive Query Strings if applicable, though it primarily aligns with CWE-798: Use of Hard-coded Credentials when considering the exposure of session tokens as static secrets within downloadable artifacts. The attack vector leverages the fact that embedded reports often utilize client-side technologies to render data, and by inspecting the HTML source or network traffic associated with these pages, an attacker can locate references to underlying search jobs. When the system generates a dispatch archive for downloading historical search results, it erroneously packages authentication material alongside the query output. This allows any individual who can trigger or access such downloads to extract valid session tokens that grant them elevated privileges within the Splunk environment.
The operational impact of this vulnerability is severe, as it enables an unauthenticated attacker to escalate their privilege level from a basic viewer role to one with full administrative capabilities over relevant data sets. Once the exposed session material is obtained, the attacker can authenticate directly into the Splunk platform without needing valid credentials provided by legitimate users. This leads to unrestricted access to all indexed data that the compromised session token permits viewing, which may include sensitive corporate information, personal identifiable information, or proprietary operational metrics. Furthermore, because the vulnerability affects system integrity through unauthorized modification potential if higher privileges are attained, it poses a significant risk to confidentiality and integrity of the entire security infrastructure managed by Splunk.
This behavior maps directly to MITRE ATT&CK technique T1078: Valid Accounts, specifically where attackers obtain legitimate credentials or tokens from misconfigured systems rather than stealing them through phishing or brute force. It also relates to T1539: Steal Web Session Cookie, as the primary mechanism of exploitation involves harvesting session identifiers that serve as proof of identity within the application context. The lack of proper separation between public-facing embedded report interfaces and internal authentication mechanisms creates a bridge for lateral movement and data exfiltration across the organization's monitoring infrastructure.
Mitigation strategies require immediate patching to versions 10.4.1, 10.2.6, 10.0.9, or 9.4.14 where this authorization boundary enforcement has been corrected by Splunk engineering teams. In environments where patching is not immediately feasible, administrators should review configurations related to embedded reports and scheduled report embeddings as detailed in the official Splunk documentation on additional configuration for embedded reports and embedding scheduled reports. It is advisable to restrict access to pages containing embedded reports to authenticated users only, thereby preventing unauthenticated parties from viewing HTML sources that might reveal underlying search job identifiers or archive links. Additionally, implementing strict network segmentation and monitoring for unusual download patterns of dispatch archives can help detect potential exploitation attempts before significant data loss occurs. Regular audits of session token handling in API responses and file downloads are essential to ensure no sensitive material is inadvertently exposed through legacy features or misconfigurations.