CVE-2025-20382
📋 TL;DR
This CVE describes an unvalidated redirect vulnerability in Splunk Enterprise and Cloud Platform where low-privileged authenticated users can create dashboard views with custom backgrounds using base64-encoded images that bypass external URL warnings. This allows redirection to malicious external sites through phishing attacks. Affected users are those running vulnerable Splunk versions without proper patching.
💻 Affected Systems
- Splunk Enterprise
- Splunk Cloud Platform
📦 What is this software?
Splunk by Splunk
Splunk by Splunk
Splunk by Splunk
Splunk by Splunk
⚠️ Risk & Real-World Impact
Worst Case
Users could be redirected to malicious sites that steal credentials, install malware, or perform other attacks through successful phishing campaigns.
Likely Case
Limited impact requiring successful phishing of authenticated users, potentially leading to credential theft or malware installation.
If Mitigated
Minimal impact with proper user awareness training and network controls preventing external malicious site access.
🎯 Exploit Status
Requires authenticated user with dashboard creation permissions and successful phishing of victim.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Splunk Enterprise: 10.0.2, 9.4.6, 9.3.8, 9.2.10; Splunk Cloud Platform: 10.1.2507.10, 10.0.2503.8, 9.3.2411.120
Vendor Advisory: https://advisory.splunk.com/advisories/SVD-2025-1201
Restart Required: Yes
Instructions:
1. Download appropriate patch version from Splunk downloads. 2. Backup current installation. 3. Stop Splunk services. 4. Apply patch following Splunk upgrade documentation. 5. Restart Splunk services. 6. Verify version and functionality.
🔧 Temporary Workarounds
Restrict dashboard creation permissions
allLimit ability to create or modify dashboard views to trusted users only.
splunk edit user <username> -role <role_without_dashboard_creation>
splunk edit role <rolename> -capability edit_dashboards false
🧯 If You Can't Patch
- Implement network controls to block access to known malicious external domains.
- Enhance user awareness training about phishing risks and dashboard interactions.
🔍 How to Verify
Check if Vulnerable:
Check Splunk version using web interface or CLI and compare against affected versions.Check Version:
splunk versionVerify Fix Applied:
Verify version is at or above patched versions and test dashboard creation with base64 image backgrounds.📡 Detection & Monitoring
Log Indicators:
- Unusual dashboard creation events
- Base64 encoded image data in dashboard configurations
- External URL redirection attempts
Network Indicators:
- Outbound connections to suspicious domains following dashboard interactions
SIEM Query:
index=_internal source=*web_access.log | search "dashboard" "base64" OR "data:image"