CVE-2025-20378: 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…
CVE-2025-20378 · Severity: low · CVSS 3.1 · Published 2025-11-12
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.
No. Junglewise Threat Intelligence has no report of CVE-2025-20378 being exploited in the wild.
How severe is CVE-2025-20378?
Low severity, with a CVSS score of 3.1, published 12 November 2025.
Which products and versions are affected?
Splunk, Splunk Cloud Platform. The advisory does not name versions.
Is there a fix for CVE-2025-20378?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2025-20378?
Check whether you run Splunk or Splunk Cloud Platform. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.