CVE-2026-76318

Received Received - Intake

Stored XSS in Splunk Enterprise Alert Trigger Conditions

Publication date: 2026-08-19

Last updated on: 2026-08-19

Assigner: Cisco Systems, Inc.

Description

In Splunk Enterprise versions below 10.4.2, 10.2.6, 10.0.9, and 9.4.14, a user that holds a role with the schedule_search capability could store a malicious script in an alert trigger condition field. When another user opens the crafted link, the script runs in the browser of that user and could access all data available to that user. The vulnerability is possible because Splunk Web uses the alert threshold value in generated alert trigger condition markup without escaping special characters. Successful exploitation requires another user to open the crafted link. For more information see Configure alert trigger conditions (https://help.splunk.com/en/splunk-enterprise/alert-and-respond/alerting-manual/10.4/manage-alert-trigger-conditions-and-throttling/configure-alert-trigger-conditions) and 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.

CVSS Scores

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Meta Information

Published

2026-08-19

Last Modified

2026-08-19

Generated

2026-08-20

AI Q&A

2026-08-20

EPSS Evaluated

N/A

NVD

CVE-2026-76318

EUVD

EUVD-2026-63125

Affected Vendors & Products

Vendor	Product	Version / Range
splunk	splunk_enterprise	to 9.4.14 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

This vulnerability affects Splunk Enterprise versions below 10.4.2, 10.2.6, 10.0.9, and 9.4.14. A user with the schedule_search capability can store a malicious script in an alert trigger condition field. When another user opens a crafted link, the script executes in their browser and may access all data available to that user. The issue occurs because Splunk Web does not properly escape special characters in the alert threshold value when generating markup.

Detection Guidance

This vulnerability involves stored XSS in Splunk alert trigger conditions. To detect it, review Splunk alert configurations for suspicious scripts in trigger conditions, especially those using roles with schedule_search capability. Check Splunk logs for unusual user activity or unauthorized data access patterns.

Impact Analysis

If exploited, an attacker could gain access to sensitive data available to the targeted user. This includes data the user has permission to view. The attack requires another user to open a malicious link, so social engineering or phishing may be involved.

Compliance Impact

This vulnerability could lead to unauthorized data access, potentially violating GDPR, HIPAA, or other regulations that require protecting sensitive information. Organizations using affected Splunk versions may face compliance risks if data is exposed.

Mitigation Strategies

Upgrade Splunk Enterprise to version 10.4.2, 10.2.6, 10.0.9, or 9.4.14 or later to address the vulnerability. Review and restrict roles with the schedule_search capability to minimize exposure.

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