Arbitrary Companion App Registration Vulnerability in Splunk Enterprise and Secure Gateway
CVE-2026-76258

6.5MEDIUM

Key Information:

Vendor

Splunk
Status
Splunk Enterprise
Splunk Secure Gateway
Vendor
CVE Published:
19 August 2026

What is CVE-2026-76258?

In specific versions of Splunk Enterprise and Splunk Secure Gateway, a user without proper privileges can register a malicious companion app. This allows for the interception and forwarding of mobile user requests, exposing sensitive data to attackers. The core issue arises from a hard-coded cryptographic key, which permits unauthorized callback URL registrations. Proper role definitions and access controls are crucial to mitigate this risk.

Affected Version(s)

Splunk Enterprise 10.4 < 10.4.2

Splunk Enterprise 10.2 < 10.2.6

Splunk Enterprise 10.0 < 10.0.9

References

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

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Gabriel Nitu, Splunk
.