External risk intelligence

Splunk Enterprise Dispatch Archive Download Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.4)

CVE-2026-76311

The vulnerability involves embedded reports in Splunk Enterprise. These reports are specifically designed to be embedded in external web pages or portals for broader access, making them commonly reachable via the internet or external-facing web environments in standard deployment configurations.

Splunk

9.4.0 to before 9.4.1410.0.0 to before 10.0.910.2.0 to before 10.2.610.4.0 to before 10.4.2

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability in Splunk Enterprise could allow an unauthenticated user with an embedded report token to access sensitive data and impact system integrity. This occurs because the system may not properly block download requests for report search jobs before sending archive data to the requester.

Unauthorized access to embedded report data.
Matters for data protection and system security.
Confirm relevance and exposure of embedded reports.

Attack Path

How an attacker could exploit the issue

An unauthenticated attacker with access to an embedded report token could exploit a flaw in how Splunk Enterprise handles dispatch archive downloads. This oversight allows the attacker to obtain sensitive data and potentially alter system integrity by bypassing authorization checks before the archive is fully processed and sent. The vulnerability stems from the authorization flow not properly blocking archive download requests early enough in the process.

Requires an embedded report token.
Download dispatch archive for embedded report.
Access sensitive data and affect system integrity.

Live Threat

Current exploitation, exposure, and threat context

An unauthenticated user with an embedded report token could potentially download dispatch archives, exposing sensitive Splunk platform data and affecting system integrity. This is possible because the authorization flow may not prevent dispatch archive downloads until after the archive has begun transferring.

Relevant Splunk data and system integrity.
Unauthenticated download of dispatch archives.
Unauthorized data access and system disruption.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability impacts Splunk Enterprise instances configured with embedded reports. The first practical move is for the Splunk platform or infrastructure team to identify all Splunk deployments, confirm if embedded reports are enabled and externally reachable, and then determine the business criticality of affected instances. Following this, work with the application or system owner to plan remediation, potentially coordinating with the vendor.

Splunk platform and infrastructure teams own.
Verify embedded report configurations and reachability.
Plan remediation based on risk assessment.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Free EASM Trial See How Signal Works

Frequently asked questions

What is Splunk Enterprise and why is it used?

Splunk Enterprise is a software platform used for searching, monitoring, and analyzing machine-generated big data. It helps organizations collect and index data from various sources to gain insights into operational performance, security events, and system health through powerful dashboards and reporting tools.

What does CVE-2026-76311 mean for security?

This vulnerability is classified as Improper Access Control (CWE-284). It means the software fails to properly verify if a user has permission to perform an action. Specifically, the system incorrectly allows unauthorized users to download dispatch archives for embedded reports, potentially exposing sensitive data and compromising platform integrity.

How does an attacker trigger this vulnerability?

An attacker needs a valid embedded report token to attempt a download. The flaw occurs because the authorization check is performed too late; the system begins sending the archive before blocking the unauthorized request. Simply navigating to the platform without this specific token will not trigger the bug.

Is my Splunk instance relevant to this risk?

According to Halo Surface Signal, this risk is highly relevant if you use embedded reports, as they are often hosted on internet-facing web pages to allow broader access. Instances that do not utilize or expose embedded reports are not subject to this specific authorization flaw.

What is the first step to address this CVE?

Start by identifying all Splunk deployments in your environment and determining if embedded reports are enabled. If they are, assess whether those reports are accessible from outside your internal network. Once identified, prioritize these instances for remediation by following the vendor's guidance.

References

advisory.splunk.com/advisories/SVD-2026-0801

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.