Stored Cross-Site Scripting (XSS) through Splunk Web in Splunk Enterprise

Summary

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.

Timeline

1. Aug 19, 2026, 9:34 PM UTCCVE published
2. Aug 26, 2026, 2:49 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Aug 26, 2026, 3:22 PM UTCRecord last updated

Affected versions

• Splunk Splunk Enterprise

  From 10.4 · fixed in 10.4.2; From 10.2 · fixed in 10.2.6; From 10.0 · fixed in 10.0.9; From 9.4 · fixed in 9.4.14

References 1