CVE-2026-76258 json
Use of Hard-coded Cryptographic Key through Companion App Registration in Splunk Secure Gateway
published 2026-08-19 2 mo ago modified 2026-10-26 13 d ago also EUVD-2026-63110
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 27%
- public exploits
- 0
- none known
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.
Patch / fix
- Splunk Splunk Enterprise 9.4.14, 10.0.9, 10.2.6, 10.4.2
- Splunk Splunk Secure Gateway 3.8.71, 3.9.24, 3.10.10
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
Affected products
- Splunk Splunk Enterprise
- Splunk Splunk Secure Gateway
Classification
- Weakness
-
- CWE-321 Use of Hard-coded Cryptographic Key
References
-
advisory.splunk.com
/advisories/SVD-2026-0801
vendor-advisory
Sources
- CVE List CVE-2026-76258
- NVD CVE-2026-76258
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