Splunk Enterprise/Cloud Platform Custom Background redirect

Summaryinfo

A vulnerability, which was classified as problematic, was found in Splunk Enterprise and Cloud Platform. This affects an unknown function of the component Custom Background Handler. Executing a manipulation can lead to redirect. This vulnerability is registered as CVE-2025-20382. It is possible to launch the attack remotely. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in Splunk Enterprise and Cloud Platform (affected version not known) and classified as problematic. This vulnerability affects some unknown functionality of the component Custom Background Handler. The manipulation with an unknown input leads to a redirect vulnerability. The CWE definition for the vulnerability is CWE-601. 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. As an impact it is known to affect integrity. CVE summarizes:

In Splunk Enterprise versions below 10.0.2, 9.4.6, 9.3.8, and 9.2.10, and Splunk Cloud Platform versions below 10.1.2507.10, 10.0.2503.8, and 9.3.2411.120, a low-privileged user that does not hold the "admin" or "power" Splunk roles could create a views dashboard with a custom background using the `data:image/png;base64` protocol that could potentially lead to an unvalidated redirect. This behavior circumvents the Splunk external URL warning mechanism by using a specially crafted URL, allowing for a redirection to an external malicious site. The vulnerability requires the attacker to phish the victim by tricking them into initiating a request within their browser. The authenticated user should not be able to exploit the vulnerability at will.

The advisory is available at advisory.splunk.com. This vulnerability was named CVE-2025-20382 since 10/10/2024. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1204.001 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 277112 (Splunk Enterprise 9.2.0 < 9.2.10, 9.3.0 < 9.3.8, 9.4.0 < 9.4.6, 10.0 < 10.0.2 (SVD-2025-1201)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (277112). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Log Management Software

Vendor

• Splunk

Name

• Cloud Platform
• Enterprise

License

• commercial

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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