CVE-2026-76258
Use of Hard-coded Cryptographic Key through Companion App Registration in Splunk Secure Gateway
Description
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.
Weakness: CWE-321
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Splunk Enterprise | SIEM & Log Management | cna-assigner |
| Cisco | Splunk Secure Gateway | SIEM & Log Management | cna-assigner |
Vendor-reported products (2)
- Splunk · Splunk Enterprise
- Splunk · Splunk Secure Gateway
Credit
Gabriel Nitu, Splunk
Vendor remediation
Upgrade Splunk Enterprise to versions 10.4.2, 10.2.6, 10.0.9, and 9.4.14, or higher.