Splunk Enterprise/Cloud Platform Username edit_user unicode encoding

CVSS Meta Temp Score
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CTI Interest Score
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6.4$0-$5k4.84

Summaryinfo

A vulnerability was found in Splunk Enterprise and Cloud Platform and classified as critical. Affected by this issue is the function edit_user of the component Username Handler. The manipulation results in improper handling of unicode encoding. This vulnerability is reported as CVE-2026-20202. The attack can be launched remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Splunk Enterprise and Cloud Platform (the affected version is unknown). Affected is the function edit_user of the component Username Handler. The manipulation with an unknown input leads to a improper handling of unicode encoding vulnerability. CWE is classifying the issue as CWE-176. The product does not properly handle when an input contains Unicode encoding. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.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.

The advisory is shared for download at advisory.splunk.com. This vulnerability is traded as CVE-2026-20202 since 10/08/2025. The exploitability is told to be difficult. It is possible to launch the attack remotely. Additional levels of successful authentication are required for exploitation. There are known technical details, but no exploit is available.

Upgrading eliminates this vulnerability.

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Productinfo

Type

Vendor

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.6
VulDB Meta Temp Score: 6.4

VulDB Base Score: 6.6
VulDB Temp Score: 6.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.6
CNA Vector (cisco): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper handling of unicode encoding
CWE: CWE-176 / CWE-172
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Timelineinfo

10/08/2025 CVE reserved
04/15/2026 +189 days Advisory disclosed
04/15/2026 +0 days VulDB entry created
04/15/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: SVD-2026-0401
Status: Confirmed

CVE: CVE-2026-20202 (🔒)
GCVE (CVE): GCVE-0-2026-20202
GCVE (VulDB): GCVE-100-357732

Entryinfo

Created: 04/15/2026 18:16
Changes: 04/15/2026 18:16 (64)
Complete: 🔍
Cache ID: 216::103

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