# CVE-2025-20378: Open Redirect on Web Login endpoint in Splunk Enterprise

> CVE-2025-20378: Open Redirect on Web Login endpoint in Splunk Enterprise. CVSS 3.1 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-20378
Last updated: 2026-10-18T20:10:00Z

- Published: 2025-11-12 17:22 UTC · Updated: 2026-10-18 20:10 UTC · Assigner: cisco
- CVSS: 3.1 (CVSS 3.1) · Severity: Low · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
- EPSS: 0.25%, 17th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: 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 vendors and products

- Splunk: Splunk Cloud Platform
- Splunk: Splunk Enterprise

## Tracked companies

- [Splunk](https://rewindex.com/company/splunk.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-20378)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-20378)
- [https://advisory.splunk.com/advisories/SVD-2025-1101](https://advisory.splunk.com/advisories/SVD-2025-1101)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-20378 · Markdown: https://rewindex.com/cve/CVE-2025-20378.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-20378 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:15:18.194Z