What’s Vulnerable › Vulnerabilities
CVE-2025-20321: Membership State Change in Splunk Search Head Cluster through a Cross-Site Request Forgery (CSRF) in Splunk Enterprise
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-07-07 · updated 2026-06-17
- Weakness: CWE-352
Description
In Splunk Enterprise versions below 9.4.3, 9.3.5, 9.2.7 and 9.1.10, and Splunk Cloud Platform versions below 9.3.2411.104, 9.3.2408.114, and 9.2.2406.119, an unauthenticated attacker can send a specially-crafted SPL search that could change the membership state in a Splunk Search Head Cluster (SHC) through a Cross-Site Request Forgery (CSRF), potentially leading to the removal of the captain or a member of the SHC.<br><br>The vulnerability requires the attacker to phish the administrator-level victim by tricking them into initiating a request within their browser. The attacker should not be able to exploit the vulnerability at will.
Affected products
- Splunk Enterprise: from 9.1.0 before 9.1.10; from 9.2.0 before 9.2.7; from 9.3.0 before 9.3.5; from 9.4.0 before 9.4.3 — fixed in 9.1.10, 9.2.7, 9.3.5, 9.4.3
- Splunk Cloud Platform: from 9.2.2406 before 9.2.2406.119; from 9.3.2408 before 9.3.2408.114; from 9.3.2411 before 9.3.2411.104 — fixed in 9.2.2406.119, 9.3.2408.114, 9.3.2411.104
How to fix
Upgrade to a fixed version: Splunk Enterprise 9.1.10, 9.2.7, 9.3.5, 9.4.3; Splunk Cloud Platform 9.2.2406.119, 9.3.2408.114, 9.3.2411.104. Check the vendor advisory for mitigations.
References
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