CVE-2026-20202

Improper Input Validation during User Account Creation in Splunk Enterprise

State: Published
Severity: 6.6 Medium
Published: Apr 15, 2026
Updated: Apr 16, 2026
Reserved: Oct 8, 2025

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.

Scores

CVSS	Score	Vector	Source
3.1	6.6 Medium	CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H	cisco

Weaknesses

CWE-176 The software does not properly handle when an input contains Unicode encoding.

Affected Products

Product	Versions
Splunk EnterpriseSplunk	10.2 to before 10.2.2Affected 10.0 to before 10.0.5Affected 9.4 to before 9.4.10Affected 9.3 to before 9.3.11Affected
Splunk Cloud PlatformSplunk	10.4.2603 to before Not AffectedAffected 10.3.2512 to before 10.3.2512.6Affected 10.2.2510 to before 10.2.2510.10Affected 10.1.2507 to before 10.1.2507.20Affected 10.0.2503 to before 10.0.2503.13Affected 9.3.2411 to before 9.3.2411.127Affected

References

https://advisory.splunk.com/advisories/SVD-2026-0401

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