Splunk Enterprise and Cloud Platform
CVE-2026-20202: Improper Input Validation during User Account Creation in Splunk Enterprise
In Splunk Enterprise versions below 10.2.2, 10.0.5, 9.4.10, and 9.3.11, and Splunk Cloud Platform versions below 10.4.2603.0, 10.3.2512.6, 10.2.2510.10, 10.1.2507.20, 10.0.2503.13, and 9.3.2411.127, a user who holds a role that contains the high-privilege capability `edit_user`could create a specially crafted username that includes a null byte or a non-UTF-8 percent-encoded byte due to improper input validation.<br><br>This could lead to inconsistent conversion of usernames into a proper format for storage and account management inconsistencies, such as being unable to edit or delete affected users.
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Splunk Enterprise 10.2 | 10.2.2 or later |
| Splunk Enterprise 10.0 | 10.0.5 or later |
| Splunk Enterprise 9.4 | 9.4.10 or later |
| Splunk Enterprise 9.3 | 9.3.11 or later |
| Splunk Cloud Platform 10.4 | Not Affected or later |
| Splunk Cloud Platform 10.3 | 10.3.2512.6 or later |
| Splunk Cloud Platform 10.2 | 10.2.2510.10 or later |
| Splunk Cloud Platform 10.1 | 10.1.2507.20 or later |
| Splunk Cloud Platform 10.0 | 10.0.2503.13 or later |
| Splunk Cloud Platform 9.3 | 9.3.2411.127 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
In Splunk Enterprise versions below 10.2.2, 10.0.5, 9.4.10, and 9.3.11, and Splunk Cloud Platform versions below 10.4.2603.0, 10.3.2512.6, 10.2.2510.10, 10.1.2507.20, 10.0.2503.13, and 9.3.2411.127, a user who holds a role that contains the high-privilege capability `edit_user`could create a specially crafted username that includes a null byte or a non-UTF-8 percent-encoded byte due to improper input validation.<br><br>This could lead to inconsistent conversion of usernames into a proper format for storage and account management inconsistencies, such as being unable to edit or delete affected users.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.