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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.

PUBLISHED Reserved 2024-10-10 | Published 2025-11-12 | Updated 2025-11-12 | Assigner cisco




LOW: 3.1CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N

Problem types

A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks.

Product status

10.0 (custom) before 10.0.1
affected

9.4 (custom) before 9.4.5
affected

9.3 (custom) before 9.3.7
affected

9.2 (custom) before 9.2.9
affected

10.0.2503 (custom) before 10.0.2503.5
affected

9.3.2411 (custom) before 9.3.2411.111
affected

9.3.2408 (custom) before 9.3.2408.121
affected

Credits

Diogo Real (c0rte)

References

advisory.splunk.com/advisories/SVD-2025-1101

cve.org (CVE-2025-20378)

nvd.nist.gov (CVE-2025-20378)

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