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CVE-2026-76257: Missing Authorization through REST API Endpoints in Splunk Secure Gateway

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-19 · updated 2026-10-26
• Weakness: CWE-862

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 holds a Splunk role with permissions to list storage passwords but does not hold Splunk Secure Gateway administration privileges could access Mobile Device Management signing secrets that compromise all affected mobile-device enrollment trust through Splunk Secure Gateway. The vulnerability is possible because Splunk Secure Gateway Representational State Transfer (REST) API endpoints for deployment bundle, Security Assertion Markup Language setup, and companion app workflows do not require Splunk Secure Gateway administration privileges before processing requests.

Affected products

• Splunk Enterprise: from 9.4.0 before 9.4.14; from 10.0.0 before 10.0.9; from 10.2.0 before 10.2.6; from 10.4.0 before 10.4.2 — fixed in 9.4.14, 10.0.9, 10.2.6, 10.4.2
• Splunk Secure Gateway: from 3.8.0 before 3.8.71; from 3.9.0 before 3.9.24; from 3.10.0 before 3.10.10 — fixed in 3.8.71, 3.9.24, 3.10.10

How to fix

Upgrade to a fixed version: Splunk Enterprise 9.4.14, 10.0.9, 10.2.6, 10.4.2; Splunk Secure Gateway 3.8.71, 3.9.24, 3.10.10. Check the vendor advisory for mitigations.

References

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

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