CVE-2026-76258

In Splunk Enterprise versions below 10.4.2, 10.2.6, 10.0.9, and 9.4.14, and Splunk Secure Gateway versions below 3.10.10, 3.9.24, and 3.8.71, a user who does not hold the "admin" or "power" Splunk roles could register an arbitrary companion app and cause Splunk Secure Gateway to forward mobile user requests, including tokens that compromise all relevant data available to the affected mobile user, to an attacker-controlled Uniform Resource Locator (URL). The vulnerability is possible because a hard-coded cryptographic key in the Splunk Secure Gateway companion app registration handler allows for arbitrary callback URL registration without restriction. For more information see Define roles on the Splunk platform with capabilities (https://help.splunk.com/en/splunk-enterprise/administer/manage-users-and-security/10.2/manage-splunk-platform-users-and-roles/define-roles-on-the-splunk-platform-with-capabilities) in the Splunk documentation.

Score

CVSS 3.1 6.5 Medium

Status

Analyzed - psirt@cisco.com

Published

2026-08-19

Last modified

2026-10-26

Weaknesses

CWE-321

Affected products

• Splunk (Splunk)
• Splunk Enterprise (Splunk)
• Splunk Secure Gateway (Splunk)

References

• https://advisory.splunk.com/advisories/SVD-2026-0801