Full Report
Splunk security advisory (AV26-838)
Analysis Summary
# Vulnerability: Multiple Vulnerabilities in Splunk Products (AV26-838)
## CVE Details
*Note: The provided advisory serves as a high-level notification (Bulletin AV26-838). Individual CVEs are detailed within the specific sub-advisories linked in the Splunk portal.*
- **CVE ID:** Multiple (Refer to Splunk Advisory Portal)
- **CVSS Score:** Varies (Up to Critical/High depending on specific component)
- **CWE:** Varies (Includes issues typically ranging from Information Disclosure to Remote Code Execution)
## Affected Systems
- **Products:**
- Splunk Enterprise
- Splunk Universal Forwarder
- Splunk SOAR / SOAR Connectors
- Splunk Enterprise Security (ES)
- Cisco Talos Intelligence for Enterprise Security Cloud
- Splunk MCP Server app
- Various Splunk Apps and Add-ons
- **Versions:**
- Splunk Enterprise/Universal Forwarder: Versions prior to 10.4.2, 10.2.6, 10.0.9, and 9.4.14
- Splunk ES: Prior to 8.6.1
- Splunk SOAR: Prior to 8.6.0
- Cisco Talos Intelligence for ES Cloud: Prior to 1.0.3
- Splunk MCP Server app: Prior to 1.2.1
- **Configurations:** Systems running the specific affected apps or outdated versions of the core Splunk engine.
## Vulnerability Description
This advisory covers a collection of security updates across the Splunk ecosystem. Historically, these updates address flaws such as insecure handling of configuration files, potential for cross-site scripting (XSS) in the Splunk Web interface, or vulnerabilities in third-party libraries bundled with the software. Specific technical details for each CVE are released individually by the Splunk Product Security team.
## Exploitation
- **Status:** Not currently reported as exploited in the wild (refer to vendor for updates).
- **Complexity:** Varies (Typically Low to Medium)
- **Attack Vector:** Network (Most commonly via Splunk Web or Management Port 8089)
## Impact
- **Confidentiality:** High/Medium (Potential unauthorized access to indexed data)
- **Integrity:** High/Medium (Potential modification of configurations or logs)
- **Availability:** Medium (Potential for Denial of Service on search heads or indexers)
## Remediation
### Patches
Update to the following versions or higher:
- **Splunk Enterprise/Forwarder:** 10.4.2, 10.2.6, 10.0.9, or 9.4.14
- **Splunk ES:** 8.6.1
- **Splunk SOAR:** 8.6.0
- **Cisco Talos Intelligence for ES Cloud:** 1.0.3
- **Splunk MCP Server app:** 1.2.1
### Workarounds
- Restrict access to the Splunk Management Port (8089) to trusted IP addresses only.
- Disable Splunk Web if not required on heavy forwarders or indexers.
- Use TLS 1.2+ for all communications.
## Detection
- Monitor `web_service.log` and `audit.log` for unusual activity or unauthorized configuration changes.
- Use the Splunk "Security Checker" app to identify known vulnerable components within the environment.
## References
- Splunk Security Advisory Portal: hxxps[://]advisory[.]splunk[.]com/advisories
- Cyber Centre Bulletin: hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/splunk-security-advisory-av26-838