CVE-2026-76263: Splunk Enterprise Auth Bypass Vulnerability

CVE-2026-76263 Overview

CVE-2026-76263 is a broken object level authorization vulnerability [CWE-639] affecting Splunk Enterprise. The flaw resides in the data management orchestrator, which fails to verify that a requesting user owns Splunk Processing Language version 2 (SPL2) modules before deleting them. A low-privileged user who does not hold the admin or power Splunk role can delete SPL2 modules belonging to other users. The issue impacts Splunk Enterprise versions below 10.4.2 and below 10.2.6. Versions below 10.2 are not affected.

Critical Impact
Authenticated low-privileged users can delete SPL2 modules owned by other users through the data management orchestrator interface, disrupting SPL2-based apps and analytics workflows.

Affected Products

Splunk Enterprise versions 10.2 through below 10.2.6
Splunk Enterprise versions 10.4 through below 10.4.2
SPL2-based apps managed through the data management orchestrator

Discovery Timeline

2026-08-19 - CVE-2026-76263 published to NVD
2026-08-20 - Last updated in NVD database

Technical Details for CVE-2026-76263

Vulnerability Analysis

The vulnerability affects the data management orchestrator component that manages SPL2 modules within Splunk Enterprise. SPL2 modules are user-owned resources that back SPL2-based apps and analytics content. The orchestrator exposes delete operations over the network to authenticated users. When a user issues a delete request for an SPL2 module, the orchestrator does not check whether the calling user owns the target resource. As a result, any authenticated user without the admin or power role can remove modules created by other users.

Root Cause

The root cause is a missing object-level authorization check [CWE-639]. The data management orchestrator authenticates the caller but does not enforce ownership on the target SPL2 module before performing the delete operation. Standard role-based access control on the endpoint does not compensate for the missing per-object check, because non-privileged roles retain access to the delete function itself.

Attack Vector

Exploitation requires network access to the Splunk Enterprise management surface and a valid low-privileged Splunk account. The attacker identifies SPL2 modules owned by other users through the orchestrator interface. The attacker then issues a delete request naming the target module. The orchestrator processes the request without verifying ownership and removes the module. Impact is limited to integrity and availability of SPL2 modules; confidentiality is not affected.

No public proof-of-concept or exploit code has been released. See the Splunk Security Advisory SVD-2026-0801 for vendor technical details.

Detection Methods for CVE-2026-76263

Indicators of Compromise

Unexpected removal of SPL2 modules from the data management orchestrator inventory.
Delete operations on SPL2 modules performed by accounts that do not own the target module and do not hold admin or power roles.
SPL2-based apps failing to load or execute due to missing module dependencies.

Detection Strategies

Review Splunk internal audit logs (_audit index) for module delete actions and correlate the acting user against the module owner.
Alert on delete requests to the data management orchestrator originating from non-privileged Splunk roles.
Baseline normal SPL2 module lifecycle activity per user and flag deviations, especially bulk deletions.

Monitoring Recommendations

Forward Splunk audit and management endpoint access logs to a central analytics platform for cross-user correlation.
Monitor for enumeration patterns preceding delete calls, such as sequential module listing requests followed by delete operations.
Track failed and successful authentication events for low-privileged accounts that interact with the data management orchestrator.

How to Mitigate CVE-2026-76263

Immediate Actions Required

Upgrade Splunk Enterprise to version 10.4.2 or 10.2.6 or later per the vendor advisory.
Audit existing Splunk user roles and remove unnecessary access to SPL2 module management endpoints.
Back up SPL2 modules and SPL2-based apps before applying patches or making configuration changes.

Patch Information

Splunk has released fixed versions 10.4.2 and 10.2.6 that add the missing ownership verification in the data management orchestrator. Refer to Splunk Security Advisory SVD-2026-0801 for full remediation guidance and download links. Splunk Enterprise versions below 10.2 do not require this patch because they are not affected.

Workarounds

Restrict network access to the Splunk management interface to trusted administrative networks only.
Limit the number of accounts able to authenticate against instances hosting SPL2-based apps until patches are applied.
Enable enhanced audit logging for SPL2 module operations to detect unauthorized deletions during the patch window.

bash

# Verify the running Splunk Enterprise version before and after patching
$SPLUNK_HOME/bin/splunk version

# List current Splunk users and roles to review privilege assignments
$SPLUNK_HOME/bin/splunk list user