TI-2026-53358 Aliases CVE-2026-76258 GHSA-3mh4-7c3j-c9mg

Use of Hard-coded Cryptographic Key through Companion App Registration in Splunk Secure Gateway

LOW 29CWE-321Published 2026-08-19 · Updated 2026-08-26

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-321.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0034 27th percentileScored 2026-11-07

Fix Fixed Splunk Enterprise (Splunk): 10.4.2, 10.2.6, 10.0.9 +1Splunk Secure Gateway (Splunk): 3.10.10, 3.9.24, 3.8.71

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Splunk	Splunk Enterprise	10.4 to before 10.4.2; 10.2 to before 10.2.6; 10.0 to before 10.0.9; 9.4 to before 9.4.14	10.4.2, 10.2.6, 10.0.9, 9.4.14	Patch available	CNA
Splunk	Splunk Secure Gateway	3.10 to before 3.10.10; 3.9 to before 3.9.24; 3.8 to before 3.8.71	3.10.10, 3.9.24, 3.8.71	Patch available	CNA

Splunk Enterprise VendorSplunk Affected 10.4 to before 10.4.2; 10.2 to before 10.2.6; 10.0 to before 10.0.9; 9.4 to before 9.4.14 Fixed in 10.4.2, 10.2.6, 10.0.9, 9.4.14 Patch available CNA
Splunk Secure Gateway VendorSplunk Affected 3.10 to before 3.10.10; 3.9 to before 3.9.24; 3.8 to before 3.8.71 Fixed in 3.10.10, 3.9.24, 3.8.71 Patch available CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:splunk:splunk:::::enterprise:::*	9.4.0 to before 9.4.14; 10.0.0 to before 10.0.9; 10.2.0 to before 10.2.6; 10.4.0 to before 10.4.2	Vulnerable	Splunk
cpe:2.3:a:splunk:splunk_secure_gateway::::::::	3.8.0 to before 3.8.71; 3.9.0 to before 3.9.24; 3.10.0 to before 3.10.10	Vulnerable	Splunk

cpe:2.3:a:splunk:splunk:*:*:*:*:enterprise:*:*:* Versions 9.4.0 to before 9.4.14; 10.0.0 to before 10.0.9; 10.2.0 to before 10.2.6; 10.4.0 to before 10.4.2 Vulnerable ·Splunk
cpe:2.3:a:splunk:splunk_secure_gateway:*:*:*:*:*:*:*:* Versions 3.8.0 to before 3.8.71; 3.9.0 to before 3.9.24; 3.10.0 to before 3.10.10 Vulnerable ·Splunk

Remediation

Fix · CNA Splunk Enterprise (Splunk) Fixed in 10.4.2, 10.2.6, 10.0.9, 9.4.14
Fix · CNA Splunk Secure Gateway (Splunk) Fixed in 3.10.10, 3.9.24, 3.8.71

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-08-19
Splunk Enterprise 10.0.9, 10.2.6 and 2 more versions
45 records Highest priority Priority MEDIUM 13 MEDIUM, 32 LOW
Other records, highest priority first
- TI-2026-53366 Improper Access Control in Embedded Report Dispatch Archives in Splunk EnterprisePriority MEDIUM 49
- TI-2026-53365 Improper Access Control through Embedded Report REST API Requests in Splunk EnterprisePriority MEDIUM 49
- TI-2026-53369 Remote Code Execution (RCE) through Splunk Web Manager Configuration in Splunk EnterprisePriority MEDIUM 42
Show all 45 records →
Release · 2026-08-19
Splunk Secure Gateway 3.10.10, 3.8.71, 3.9.24
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2026-53357 Missing Authorization through REST API Endpoints in Splunk Secure GatewayPriority LOW 29
Show all 2 records →

Timeline

2026-10-02 Threatist record created from CVE-2026-76258
2026-10-03 Alias added: GHSA-3mh4-7c3j-c9mg

References

Advisory 1

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

TI-2026-16444 Unauthenticated Arbitrary File Creation and Truncation in a PostgreSQL Sidecar Service Endpoint in Splunk Enterprise KEVCVSS 3.1CRITICAL 9.8
TI-2014-00154 The (1) TLS and (2) DTLS implementations in OpenSSL 1.0.1 before 1.0.1g do not properly… KEVCVSS 3.1HIGH 7.5
TI-2023-24841 Remote code execution (RCE) in Splunk Enterprise through Insecure XML Parsing CVSS 3.1HIGH 8.8
TI-2023-15979 ‘edit_user’ Capability Privilege Escalation CVSS 3.1HIGH 8.8
TI-2024-30707 Remote Code Execution (RCE) due to insecure session storage configuration in Splunk Enterprise on Windows CVSS 3.1HIGH 8.8
TI-2022-21345 Reflected Cross-Site Scripting via the radio template in Splunk Enterprise CVSS 3.1HIGH 8.8

See all 297 →

Sources

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