A newly disclosed critical vulnerability has been identified in various versions of Splunk’s Enterprise and Cloud platforms, potentially allowing for remote code execution attacks. Known as CVE-2026-20204, this high-severity issue has been assigned a CVSS score of 7.1, highlighting its significant threat to network security.
Details of the Splunk Vulnerability
The flaw was discovered by Splunk researcher Gabriel Nitu and involves improper management of temporary files within the Splunk Web component. Classified under CWE-377, the vulnerability arises due to insufficient isolation of these files, which could be exploited by attackers to manipulate system processes.
To leverage this vulnerability, an attacker requires only basic access, such as a low-privileged user account, to upload a malicious file to the SPLUNK_HOME/var/run/splunk/apptemp directory. Once uploaded, the file can be executed remotely, compromising the host system.
Impact on Splunk Platforms
For organizations using Splunk Enterprise, the vulnerability affects several release branches, particularly versions prior to 10.2.1 in the 10.2 series, before 10.0.5 in the 10.0 series, versions 9.4.0 through 9.4.9, and up to 9.3.10 in the 9.3 series. Similarly, Splunk Cloud Platform users are at risk if using versions below 10.3.2512.5, 10.2.2510.9, 10.1.2507.19, 10.0.2503.13, and 9.3.2411.127.
Fortunately, Splunk has confirmed that the 10.4.2603 branch is not affected by this vulnerability, providing a secure upgrade path for users.
Recommended Mitigation Strategies
To protect against potential exploitation, Splunk’s security advisory (SVD-2026-0403) suggests several immediate actions. Organizations are advised to update their Splunk Enterprise installations to the latest secure versions, such as 10.2.1, 10.0.5, 9.4.10, and 9.3.11, or newer.
Additionally, security teams should closely monitor Splunk Cloud Platform instances, as automated patches are being deployed. As a temporary measure, disabling the Splunk Web component or modifying its configuration to shut down the web interface can help mitigate the threat until permanent fixes are in place.
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