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

What is CVE-2026-20202?

CVE-2026-20202 is a medium-severity vulnerability in Splunk Splunk, published on 15 Apr 2026.

Official 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.

Weakness: CWE-176

Which versions are affected by CVE-2026-20202?

It affects 2 products.

Products include Splunk Splunk, Splunk Splunk Cloud Platform.

How do I fix CVE-2026-20202?

No fix has been published for CVE-2026-20202 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-20202 being exploited?

There is no known exploitation of CVE-2026-20202 in the wild and no public exploit code.

Other vulnerabilities in Splunk Splunk

• CVE-2026-20253 Splunk Enterprise Missing Authentication for Critical Function Exploited Critical 9.8
• CVE-2026-76268 Missing Authentication for Critical Function in the Patroni REST API in Splunk Enterprise Critical 9.8
• CVE-2026-76284 Improper Neutralization in Splunk Enterprise Critical 9.8
• CVE-2026-76285 Improper Adherence to Coding Standards in Splunk Enterprise Critical 9.8
• CVE-2017-17067 Auth bypass in n/a Critical 9.8

All Splunk Splunk vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-p3vg-7hj9-6f24.