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CVE-2026-20202: Improper Input Validation during User Account Creation in Splunk Enterprise

• Severity: medium (CVSS 6.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-15 · updated 2026-10-26
• Weakness: CWE-176

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.

Affected products

• Splunk Enterprise: from 9.3.0 before 9.3.11; from 9.4.0 before 9.4.10; from 10.0.0 before 10.0.5; from 10.2.0 before 10.2.2 — fixed in 9.3.11, 9.4.10, 10.0.5, 10.2.2
• Splunk Cloud Platform: from 9.3.2411 before 9.3.2411.127; from 10.0.2503 before 10.0.2503.13; from 10.1.2507 before 10.1.2507.20; from 10.2.2510 before 10.2.2510.10; from 10.3.2512 before 10.3.2512.6 — fixed in 9.3.2411.127, 10.0.2503.13, 10.1.2507.20, 10.2.2510.10, 10.3.2512.6

How to fix

Upgrade to a fixed version: Splunk Enterprise 9.3.11, 9.4.10, 10.0.5, 10.2.2; Splunk Cloud Platform 9.3.2411.127, 10.0.2503.13, 10.1.2507.20, 10.2.2510.10. Check the vendor advisory for mitigations.

References

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

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