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8.1
HIGH CVSS 3.1
CVE-2026-76338
Improper Authentication through REST API Distributed Search Token Requests in Splunk Enterprise
Overview
Description

In Splunk Enterprise versions below 10.4.2, 10.2.6, 10.0.9, and 9.4.14, an unauthenticated user who has access to a trusted distributed search private key could forge an administrative session token, access all relevant data, affect system integrity, and disrupt service availability. The vulnerability is possible because the distributed search authentication token endpoint does not require a signed request to identify a configured search peer, allowing the request to fall back to shared local key material. For more information see About distributed search (https://help.splunk.com/en/splunk-enterprise/administer/distributed-search/10.4/overview-of-distributed-search/about-distributed-search) and authentication.conf (https://help.splunk.com/en/splunk-enterprise/administer/admin-manual/10.4/configuration-file-reference/10.4.2-configuration-file-reference/authentication.conf) in Splunk documentation.

Details
INFO

Published Date :

Aug. 19, 2026, 10:17 p.m.

Last Modified :

Aug. 27, 2026, 5:20 p.m.

Remotely Exploit :

No

Source :

[email protected]
Impact
Affected Products

The following products are affected by CVE-2026-76338 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.

ID Vendor Product Action
1 Splunk splunk
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 134c704f-9b21-4f2e-91b3-4a467353bcc0
CVSS 3.1 HIGH d1c1063e-7a18-46af-9102-31f8928bc633
CVSS 3.1 HIGH [email protected]
CVSS 3.1 HIGH MITRE-CVE
Solution
Update Splunk Enterprise to a patched version to fix authentication bypass.
  • Update Splunk Enterprise to version 10.4.2 or later.
  • Apply patches for versions 10.2.6, 10.0.9, and 9.4.14.
  • Ensure secure handling of distributed search private keys.
References
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-2026-76338.

URL Resource
https://advisory.splunk.com/advisories/SVD-2026-0801 Vendor Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-76338 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-2026-76338 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-2026-76338 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-76338 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.

  • CVE Modified by [email protected]

    Aug. 27, 2026

    Action Type Old Value New Value
    Added Reference https://advisory.splunk.com/advisories/SVD-2026-0801
    Removed Reference https://advisory.splunk.com/advisories/SVD-2026-0801
    Removed Reference Type https://advisory.splunk.com/advisories/SVD-2026-0801 Types: Vendor Advisory
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Aug. 27, 2026

    Action Type Old Value New Value
    Changed SSVC {'id': 'CVE-2026-76338', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-20T00:00:00+00:00'} {'id': 'CVE-2026-76338', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-21T03:56:21.939134Z'}
  • Initial Analysis by [email protected]

    Aug. 21, 2026

    Action Type Old Value New Value
    Added CPE Configuration OR *cpe:2.3:a:splunk:splunk:*:*:*:*:enterprise:*:*:* versions from (including) 10.0.0 up to (excluding) 10.0.9 *cpe:2.3:a:splunk:splunk:*:*:*:*:enterprise:*:*:* versions from (including) 10.2.0 up to (excluding) 10.2.6 *cpe:2.3:a:splunk:splunk:*:*:*:*:enterprise:*:*:* versions from (including) 10.4.0 up to (excluding) 10.4.2 *cpe:2.3:a:splunk:splunk:*:*:*:*:enterprise:*:*:* versions from (including) 9.4.0 up to (excluding) 9.4.14
    Added Reference Type Cisco Systems, Inc.: https://advisory.splunk.com/advisories/SVD-2026-0801 Types: Vendor Advisory
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Aug. 21, 2026

    Action Type Old Value New Value
    Added SSVC {'id': 'CVE-2026-76338', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-20T00:00:00+00:00'}
  • New CVE Received by [email protected]

    Aug. 19, 2026

    Action Type Old Value New Value
    Added Affected [{'vendor': 'Splunk', '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'}]}]
    Added Description In Splunk Enterprise versions below 10.4.2, 10.2.6, 10.0.9, and 9.4.14, an unauthenticated user who has access to a trusted distributed search private key could forge an administrative session token, access all relevant data, affect system integrity, and disrupt service availability. The vulnerability is possible because the distributed search authentication token endpoint does not require a signed request to identify a configured search peer, allowing the request to fall back to shared local key material. For more information see About distributed search (https://help.splunk.com/en/splunk-enterprise/administer/distributed-search/10.4/overview-of-distributed-search/about-distributed-search) and authentication.conf (https://help.splunk.com/en/splunk-enterprise/administer/admin-manual/10.4/configuration-file-reference/10.4.2-configuration-file-reference/authentication.conf) in Splunk documentation.
    Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
    Added CWE CWE-287
    Added Reference https://advisory.splunk.com/advisories/SVD-2026-0801
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 8.1
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact