Improper Handling of Unicode Encoding in Splunk Enterprise - CVE-2026-20202
Published: April 17, 2026
Vulnerability identifier: #VU126411
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-20202
CWE-ID: CWE-176
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Splunk Inc.
Affected software:
Splunk Enterprise
Splunk Enterprise
Detailed vulnerability description
The vulnerability allows a remote user to cause account management inconsistencies.
The vulnerability exists due to improper input validation in the REST API user account creation functionality when processing specially crafted usernames containing a null byte or a non-UTF-8 percent-encoded byte. A remote privileged user can create a specially crafted username to cause account management inconsistencies.
Affected accounts may become impossible to edit or delete.
How to mitigate CVE-2026-20202
Install security update from vendor's website.