What is CVE-2025-20378?

CVE-2025-20378 is a low-severity vulnerability in Splunk, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 3.1/10. Published 2025-11-12.

How severe is CVE-2025-20378?

Low severity. CVSS v3 base score is 3.1 out of 10.

Open Redirect in Splunk

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, 9.3.2411.111, and 9.3.2408.121, an unauthenticated attacker could craft a malicious URL using the `return_to` parameter…

Vulnerability class: Open Redirect

EPSS: 0.002 (10.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N.

Affected products

Splunk — versions 10.0.0
Splunk Cloud Platform — versions 10.0.2503, 9.3.2411, 9.3.2408
Splunk Splunk_cloud_platform
Splunk Enterprise — versions 10.0, 9.4, 9.3

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

psirt@cisco.com (Vendor Advisory)

Frequently asked questions

What is CVE-2025-20378?: CVE-2025-20378 is a low-severity vulnerability in Splunk, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 3.1/10. Published 2025-11-12.
How severe is CVE-2025-20378?: Low severity. CVSS v3 base score is 3.1 out of 10.