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.
Advisories

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Fixes

Solution

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Workaround

No workaround given by the vendor.

History

Wed, 12 Nov 2025 23:00:00 +0000

Type Values Removed Values Added
First Time appeared Splunk
Splunk splunk
Splunk splunk Enterprise
Vendors & Products Splunk
Splunk splunk
Splunk splunk Enterprise

Wed, 12 Nov 2025 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 12 Nov 2025 15:15:00 +0000

Type Values Removed Values Added
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.
Title Open Redirect on Web Login endpoint in Splunk Enterprise
Weaknesses CWE-601
References
Metrics cvssV3_1

{'score': 3.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published:

Updated: 2025-11-12T21:04:48.103Z

Reserved: 2024-10-10T19:15:13.263Z

Link: CVE-2025-20378

cve-icon Vulnrichment

Updated: 2025-11-12T20:47:33.851Z

cve-icon NVD

Status : Received

Published: 2025-11-12T18:15:34.847

Modified: 2025-11-12T18:15:34.847

Link: CVE-2025-20378

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-11-12T22:12:10Z