What’s Vulnerable › Vulnerabilities
CVE-2025-20378: Open Redirect on Web Login endpoint in Splunk Enterprise
- Severity: medium (CVSS 6.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-11-12 · updated 2026-10-18
- Weakness: CWE-601
Description
In Splunk Enterprise versions below 10.0.1, 9.4.5, 9.3.7, 9.2.9, and Splunk Cloud Platform versions below 10.0.2503.5, 9.3.2411.111, and 9.3.2408.121, an unauthenticated attacker could craft a malicious URL using the `return_to` parameter of the Splunk Web login endpoint. When an authenticated user visits the malicious URL, it could cause an unvalidated redirect to an external malicious site. To be successful, the attacker has to trick the victim into initiating a request from their browser. The unauthenticated attacker should not be able to exploit the vulnerability at will.
Affected products
- Splunk Enterprise: from 9.2.0 before 9.2.9; from 9.3.0 before 9.3.7; from 9.4.0 before 9.4.5; 10.0.0 — fixed in 9.2.9, 9.3.7, 9.4.5
- Splunk Cloud Platform: from 9.3.2408 before 9.3.2408.121; from 9.3.2411 before 9.3.2411.111; from 10.0.2503 before 10.0.2503.5 — fixed in 10.0.2503.5, 9.3.2408.121, 9.3.2411.111
How to fix
Upgrade to a fixed version: Splunk Enterprise 9.2.9, 9.3.7, 9.4.5; Splunk Cloud Platform 10.0.2503.5, 9.3.2408.121, 9.3.2411.111. Check the vendor advisory for mitigations.
References
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