CVE-2025-20227: Splunk Enterprise Auth Bypass Vulnerability

CVE-2025-20227 Overview

CVE-2025-20227 is an input validation vulnerability [CWE-20] in Splunk Enterprise and Splunk Cloud Platform. A low-privileged user without the admin or power Splunk roles can bypass the external content warning modal dialog box in Dashboard Studio dashboards. The bypass can lead to information disclosure.

Splunk published the issue in Splunk Security Advisory SVD-2025-0306 on March 26, 2025. The vulnerability affects Splunk Enterprise versions below 9.4.1, 9.3.3, 9.2.5, and 9.1.8, along with several Splunk Cloud Platform releases.

Critical Impact
Authenticated low-privileged users can bypass the external content confirmation prompt in Dashboard Studio, exposing users to unvetted external content and potential information disclosure.

Affected Products

Splunk Enterprise versions below 9.4.1, 9.3.3, 9.2.5, and 9.1.8
Splunk Cloud Platform versions below 9.3.2408.107, 9.2.2406.112, and 9.2.2403.115
Splunk Cloud Platform versions below 9.1.2312.208 and 9.1.2308.214

Discovery Timeline

2025-03-26 - CVE-2025-20227 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-20227

Vulnerability Analysis

Dashboard Studio in Splunk presents a warning modal when a dashboard references external content. This modal exists so users can review and consent before the platform fetches or renders resources hosted outside the Splunk deployment. The control is a defense against unintentional data exposure and social-engineering risks embedded in shared dashboards.

CVE-2025-20227 allows an authenticated user without elevated Splunk roles to bypass that confirmation step. Because the bypass sidesteps the user consent flow, external content can be rendered or requested without acknowledgment. The advisory describes the resulting impact as information disclosure. Splunk classifies the issue under CWE-20 (Improper Input Validation).

Root Cause

The root cause is improper validation of the state or parameters that gate the external content warning modal in Dashboard Studio. The dashboard runtime does not sufficiently enforce that the confirmation was legitimately acknowledged before proceeding. As a result, a crafted interaction or request bypasses the warning while still triggering the external content path.

Attack Vector

Exploitation requires network access to a vulnerable Splunk Enterprise or Splunk Cloud Platform instance and authenticated session context. The attacker must hold a Splunk role, but not admin or power. No user interaction from a victim is required to trigger the bypass. Successful exploitation exposes information available through the external content interaction; it does not directly affect integrity or availability.

No public proof-of-concept exploit is available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. The EPSS probability is 0.413%.

Detection Methods for CVE-2025-20227

Indicators of Compromise

Dashboard Studio activity from non-admin, non-power accounts that references external URLs or content endpoints.
Unexpected outbound HTTP requests originating from Splunk web components tied to Dashboard Studio sessions.
Audit log entries showing dashboard views that reference external resources without a corresponding user acknowledgment event.

Detection Strategies

Review Splunk _audit and _internal indexes for Dashboard Studio load events correlated to low-privileged user sessions.
Baseline expected external content usage per role, then alert on Dashboard Studio external requests from users lacking admin or power roles.
Inspect web proxy or egress logs for Splunk server-originating requests to unfamiliar external hosts referenced by dashboards.

Monitoring Recommendations

Enable and forward Splunk platform audit logs to a centralized analytics platform for role-based anomaly detection.
Track dashboard creation and modification events, especially those introducing external content references.
Alert on repeated dashboard access events by the same low-privileged principal against dashboards containing external content.

How to Mitigate CVE-2025-20227

Immediate Actions Required

Upgrade Splunk Enterprise to 9.4.1, 9.3.3, 9.2.5, 9.1.8, or later as applicable to your deployment channel.
Confirm Splunk Cloud Platform tenants are running a fixed release (9.3.2408.107, 9.2.2406.112, 9.2.2403.115, 9.1.2312.208, 9.1.2308.214, or later).
Audit Dashboard Studio dashboards for unexpected external content references introduced by non-administrative users.

Patch Information

Splunk released fixed versions across supported Enterprise and Cloud Platform branches. Refer to Splunk Security Advisory SVD-2025-0306 for the authoritative version matrix and remediation guidance. Splunk Cloud Platform customers receive the fix through the vendor-managed update process.

Workarounds

Restrict dashboard creation and edit permissions to trusted roles until patching is complete.
Limit outbound network access from Splunk Web components to reduce impact of external content requests.
Review and remove untrusted Dashboard Studio dashboards, particularly those authored by low-privileged users.

bash

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

# Example: list Dashboard Studio views for review
$SPLUNK_HOME/bin/splunk search 'index=_internal sourcetype=splunk_web_access uri_path="*/data/ui/views/*" | stats count by user, uri_path'