Medium severity · published Apr 15, 2026
CVE-2026-20202
Improper Input Validation during User Account Creation in Splunk Enterprise
6.6
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SC
Splunk Cloud Platform · Splunk
10.4.2603 before Not Affected; 10.3.2512 before 10.3.2512.6; 10.2.2510 before 10.2.2510.10; 10.1.2507 before 10.1.2507.20; 10.0.2503 before 10.0.2503.13; 9.3.2411 before 9.3.2411.127 · source: vendor, NVD
SE
Splunk Enterprise · Splunk
10.2 before 10.2.2; 10.0 before 10.0.5; 9.4 before 9.4.10; 9.3 before 9.3.11 · source: vendor
SP
Splunk · Splunk
9.3.0 before 9.3.11; 9.4.0 before 9.4.10; 10.0.0 before 10.0.5; 10.2.0 before 10.2.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-20202
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-20202
Vendor Advisory
https://advisory.splunk.com/advisories/SVD-2026-0401
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