CVE-2026-20202
Last modified
CVE-2026-20202 is a medium-severity vulnerability rated 6.6/10 on the CVSS scale. 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.. EPSS estimates a 0.25% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Splunk | Splunk | >= 9.3.0, < 9.3.11 |
| Splunk | Splunk | >= 9.4.0, < 9.4.10 |
| Splunk | Splunk | >= 10.0.0, < 10.0.5 |
| Splunk | Splunk | >= 10.2.0, < 10.2.2 |
| Splunk | Splunk Cloud Platform | >= 9.3.2411, < 9.3.2411.127 |
| Splunk | Splunk Cloud Platform | >= 10.0.2503, < 10.0.2503.13 |
| Splunk | Splunk Cloud Platform | >= 10.1.2507, < 10.1.2507.20 |
| Splunk | Splunk Cloud Platform | >= 10.2.2510, < 10.2.2510.10 |
| Splunk | Splunk Cloud Platform | >= 10.3.2512, < 10.3.2512.6 |
References
- https://advisory.splunk.com/advisories/SVD-2026-0401Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
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