CVE-2026-76258
Use of Hard-coded Cryptographic Key through Companion App Registration in Splunk Secure Gateway
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 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.
INFO
Published Date :
Aug. 19, 2026, 10:17 p.m.
Last Modified :
Aug. 19, 2026, 10:17 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-76258
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | d1c1063e-7a18-46af-9102-31f8928bc633 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE |
Solution
- Update Splunk Enterprise to version 10.4.2 or later.
- Update Splunk Enterprise to version 10.2.6 or later.
- Update Splunk Enterprise to version 10.0.9 or later.
- Update Splunk Enterprise to version 9.4.14 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-76258.
| URL | Resource |
|---|---|
| https://advisory.splunk.com/advisories/SVD-2026-0801 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-76258 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-76258
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-76258 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-76258 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Aug. 19, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Splunk', 'modules': ['Splunk Secure Gateway'], 'product': 'Splunk Enterprise', 'versions': [{'status': 'affected', 'version': '10.4', 'lessThan': '10.4.2', 'versionType': 'custom'}, {'status': 'affected', 'version': '10.2', 'lessThan': '10.2.6', 'versionType': 'custom'}, {'status': 'affected', 'version': '10.0', 'lessThan': '10.0.9', 'versionType': 'custom'}, {'status': 'affected', 'version': '9.4', 'lessThan': '9.4.14', 'versionType': 'custom'}]}, {'vendor': 'Splunk', 'product': 'Splunk Secure Gateway', 'versions': [{'status': 'affected', 'version': '3.10', 'lessThan': '3.10.10', 'versionType': 'custom'}, {'status': 'affected', 'version': '3.9', 'lessThan': '3.9.24', 'versionType': 'custom'}, {'status': 'affected', 'version': '3.8', 'lessThan': '3.8.71', 'versionType': 'custom'}]}] Added 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 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Added CWE CWE-321 Added Reference https://advisory.splunk.com/advisories/SVD-2026-0801