CVE-2026-76258
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk16th percentile - higher than 16% of all known CVEs
Summary
In Splunk Enterprise below 10.4.2, 10.2.6, 10.0.9, and 9.4.14, and Splunk Secure Gateway below 3.10.10, 3.9.24, and 3.8.71, a user without 'admin' or 'power' roles can register an arbitrary companion app and cause Splunk Secure Gateway to forward mobile user requests, including tokens, to an attacker-controlled URL. The vulnerability is due to a hard-coded cryptographic key in the companion app registration handler allowing unrestricted callback URL registration.
Risk Assessment
An attacker could intercept tokens and mobile user data, potentially leading to confidentiality and integrity breaches and unauthorized access to systems.
Recommendation
Upgrade Splunk Enterprise and Splunk Secure Gateway to patched versions. Restrict companion app registration to trusted users only.
Other vulnerabilities in Splunk Secure Gateway
See all- CVE-2026-76265Medium
In Splunk Enterprise versions below 10.4.3, 10.2.7, 10.0.10, and 9.4.15, and Splunk Secure Gateway versions below 3.10.11, 3.9.25, and 3.8.72, a user without the admin or power roles could access privileged Splunk Secure Gateway functionality. With this access, the user could cause Splunk Secure Gateway to sign attacker-controlled payloads. The vulnerability is due to multiple REST API endpoints not enforcing authorization requirements before processing requests.
- CVE-2026-76351High
In Splunk Enterprise versions below 10.4.2, 10.2.6, 10.0.9, and 9.4.14, and Splunk Secure Gateway versions below 3.10.9, 3.9.23, and 3.8.70, a user who does not hold the "admin" or "power" Splunk roles could use crafted report notification data to cause Splunk Secure Gateway to send a request to the Splunk Enterprise REST API using a system-level session token and modify the Splunk platform configuration. The user could then obtain a session token without a password and use it to access all relevant data and affect system integrity. The vulnerability exists because Splunk Secure Gateway does not validate decoded report notification identifiers before using them to construct requests to the Splunk Enterprise REST API.
- CVE-2026-76261Medium
In Splunk Enterprise below 10.4.2, 10.2.6, 10.0.9, and 9.4.14, and Splunk Secure Gateway below 3.10.9, 3.9.23, and 3.8.70, a user without 'admin' or 'power' roles can read Spacebridge private keys via the Key Value Store REST API. The vulnerability occurs on instances upgraded from older versions when private-key migration is incomplete, leaving keys in a collection with an insecure default ACL.
- CVE-2026-76257Medium
In Splunk Enterprise below 10.4.2, 10.2.6, 10.0.9, and 9.4.14, and Splunk Secure Gateway below 3.10.10, 3.9.24, and 3.8.71, a user with permissions to list storage passwords but without Splunk Secure Gateway admin privileges can access MDM signing secrets, compromising mobile-device enrollment trust. The vulnerability is due to REST API endpoints for deployment bundle, SAML setup, and companion app workflows not requiring Splunk Secure Gateway admin privileges.
- CVE-2026-76256Medium
In Splunk Enterprise below 10.4.2, 10.2.6, 10.0.9, and 9.4.14, and Splunk Secure Gateway below 3.10.9, 3.9.23, and 3.8.70, a user without 'admin' or 'power' roles can read sensitive SAML setup and instance settings information via Splunk Secure Gateway REST API endpoints. The vulnerability is due to these endpoints not enforcing authorization requirements before returning configuration information.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS