CVE-2026-76317: Splunk Enterprise Privilege Escalation Flaw

CVE-2026-76317 Overview

CVE-2026-76317 is a path traversal vulnerability [CWE-26] in Splunk Enterprise that allows a low-privileged authenticated user to move files readable by the Splunk service account into a lookup they control. The flaw resides in the lookup configuration endpoint, which fails to resolve lookup source paths before validating them against the allowed lookup staging area. An attacker without admin or power roles can access sensitive data and affect integrity and availability on the search head. Splunk addressed the issue in versions 10.4.2, 10.2.6, 10.0.9, and 9.4.14.

Critical Impact
Low-privileged Splunk users can exfiltrate files accessible to the Splunk service account and impact search head integrity and availability.

Affected Products

Splunk Enterprise versions below 10.4.2
Splunk Enterprise versions below 10.2.6
Splunk Enterprise versions below 10.0.9 and 9.4.14

Discovery Timeline

2026-08-19 - CVE-2026-76317 published to NVD
2026-08-20 - Last updated in NVD database

Technical Details for CVE-2026-76317

Vulnerability Analysis

The vulnerability affects the lookup configuration endpoint in Splunk Enterprise. Splunk lookups enrich search results by referencing external files, and Splunk restricts lookup sources to a designated staging area on the search head. The endpoint validates the submitted path against this allowed directory, but it performs the check before resolving symbolic links, relative segments, or canonical paths.

An authenticated user who lacks the admin or power roles can supply a lookup source path that appears legitimate during validation. Once accepted, path resolution occurs against a location outside the staging area. The user can then move any file readable by the operating system account running Splunk Enterprise into a lookup they control and query its contents through the search interface.

Root Cause

The root cause is improper path canonicalization [CWE-26]. The lookup configuration endpoint validates raw user-supplied paths against the allowed staging directory instead of resolving them to absolute canonical paths first. This ordering mistake enables traversal outside the intended boundary.

Attack Vector

Exploitation requires network access to the Splunk Enterprise search head and valid credentials for any authenticated role below power. The attacker submits a crafted request to the lookup configuration endpoint referencing a target path outside the lookup staging area. After the endpoint accepts the path, the attacker retrieves the file contents by searching against the newly created lookup, exposing configuration files, secrets, or other data readable by the Splunk service account.

No verified public exploit code is available. See the Splunk Security Advisory SVD-2026-0801 for vendor-supplied technical details.

Detection Methods for CVE-2026-76317

Indicators of Compromise

Unexpected lookup definitions created by non-administrative users referencing paths outside the standard $SPLUNK_HOME/etc/apps/<app>/lookups/ directories.
Search activity from low-privileged accounts targeting newly created lookups that resolve to sensitive filesystem locations.
Audit log entries showing REST calls to /services/data/lookup-table-files or /servicesNS/<user>/<app>/data/lookup-table-files with traversal sequences in the name or path parameter.

Detection Strategies

Review _audit index entries for lookup creation and modification events, filtering on users lacking admin or power roles.
Correlate lookup creation events with subsequent | inputlookup searches by the same user to identify data staging and exfiltration sequences.
Alert on lookup file paths that resolve to directories outside the sanctioned lookup staging area after canonicalization.

Monitoring Recommendations

Enable and forward Splunk internal audit logs to a centralized analytics platform for correlation across users, roles, and REST endpoint activity.
Monitor filesystem access by the Splunk service account for reads against configuration files, credential stores, and other sensitive artifacts outside expected paths.
Track REST API traffic to lookup-table-file endpoints and baseline normal user behavior to detect deviations.

How to Mitigate CVE-2026-76317

Immediate Actions Required

Upgrade Splunk Enterprise to version 10.4.2, 10.2.6, 10.0.9, 9.4.14, or later, depending on your deployment branch.
Audit all existing lookup definitions and remove any created by non-administrative users that reference paths outside the intended staging directories.
Review role assignments and revoke unnecessary lookup-related capabilities from users who do not require them.

Patch Information

Splunk released fixed versions 10.4.2, 10.2.6, 10.0.9, and 9.4.14. Complete remediation details are available in the Splunk Security Advisory SVD-2026-0801.

Workarounds

If immediate patching is not feasible, restrict the edit_lookups capability and related lookup-management permissions to trusted administrative roles only.
Limit search head access to authenticated networks and enforce multi-factor authentication for all Splunk users.
Run the Splunk service account with the least filesystem privileges necessary to reduce the scope of readable files exposed by exploitation.

bash

# Verify installed Splunk Enterprise version
$SPLUNK_HOME/bin/splunk version

# List roles and their capabilities to identify users with lookup edit rights
$SPLUNK_HOME/bin/splunk list role -auth admin:<password>