CVE-2026-76336 Overview
CVE-2026-76336 is a broken access control vulnerability [CWE-862] in Splunk Enterprise. The flaw exists in the Search Processing Language 2 (SPL2) module management Representational State Transfer (REST) API. A low-privileged user who does not hold the admin or power Splunk roles can delete all SPL2 modules across every app and user on the instance. The vulnerability affects Splunk Enterprise versions below 10.4.2 and 10.2.6. Versions below 10.2 are not affected. Splunk documented the issue in Splunk Security Advisory SVD-2026-0801.
Critical Impact
An authenticated non-privileged user can delete all SPL2 modules, removing exported datasets and functions, affecting system integrity, and causing partial service disruption.
Affected Products
- Splunk Enterprise versions 10.2 through below 10.2.6
- Splunk Enterprise versions 10.3 through below 10.4.2
- SPL2 module management REST API component
Discovery Timeline
- 2026-08-19 - CVE-2026-76336 published to NVD
- 2026-08-20 - Last updated in NVD database
Technical Details for CVE-2026-76336
Vulnerability Analysis
The vulnerability resides in the SPL2 module management REST API exposed by Splunk Enterprise. SPL2 modules bundle searches, functions, datasets, and views that users export for reuse across apps. The REST API endpoint that handles module deletion does not enforce the authorization checks required by the SPL2 module permissions model. As a result, any authenticated user can issue delete requests that affect modules owned by other users and apps.
Successful exploitation removes exported datasets and functions that downstream dashboards, alerts, and scheduled searches depend on. Loss of these modules disrupts search workloads and breaks integrations that reference the deleted objects. The impact is limited to integrity and partial availability; the vulnerability does not expose confidential data.
Root Cause
The root cause is missing authorization [CWE-862]. The SPL2 module management REST API does not sufficiently authorize and validate module deletion requests against the caller's Splunk role. The admin and power role checks that gate destructive SPL2 operations elsewhere are absent from this code path.
Attack Vector
Exploitation requires network access to the Splunk Enterprise REST management interface and valid credentials for any Splunk account. The attacker sends a crafted deletion request to the SPL2 module management REST API. No user interaction is required. Because the API accepts the request without role validation, deletion proceeds across all apps and users. See the Splunk documentation on Manage SPL2 modules and Module permissions for API context.
No public proof-of-concept has been released. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.
Detection Methods for CVE-2026-76336
Indicators of Compromise
- Unexpected DELETE requests to SPL2 module management REST API endpoints originating from non-admin accounts.
- Sudden disappearance of SPL2 modules, exported datasets, or functions from multiple apps in a short time window.
- Broken scheduled searches, dashboards, or alerts that reference SPL2 datasets or functions that no longer resolve.
- Splunk audit log entries showing module deletion actions attributed to users without the admin or power role.
Detection Strategies
- Monitor Splunk _audit and _internal indexes for REST API calls targeting SPL2 module management paths with the HTTP DELETE method.
- Correlate the acting user's role assignments with the sensitivity of the deleted object to identify unauthorized destructive actions.
- Baseline normal SPL2 module lifecycle activity per app and alert on volume anomalies.
Monitoring Recommendations
- Enable verbose REST endpoint auditing on the Splunk management port and forward audit logs to a centralized analytics platform.
- Track deletion events for SPL2 modules against a known-good inventory and alert on any deviation.
- Review authentication logs for unusual login patterns from accounts that have no operational need to call the SPL2 REST API.
How to Mitigate CVE-2026-76336
Immediate Actions Required
- Upgrade Splunk Enterprise to version 10.4.2 or 10.2.6 or later as specified in Splunk Security Advisory SVD-2026-0801.
- Inventory current SPL2 modules and back up module definitions before applying the patch or performing any recovery.
- Audit accounts with access to the Splunk management port and revoke unnecessary authenticated access.
Patch Information
Splunk has released fixed versions 10.4.2 and 10.2.6 that add authorization checks to the SPL2 module management REST API. Administrators running any affected version at or above 10.2 must upgrade to a fixed release. Splunk Enterprise versions below 10.2 do not contain the vulnerable code path.
Workarounds
- Restrict network access to the Splunk management REST port so that only trusted administrative hosts can reach it.
- Limit the number of Splunk accounts that can authenticate to the REST API and enforce strong credential hygiene.
- Maintain regular backups of SPL2 modules and exported datasets to support rapid recovery if deletion occurs.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
