CVE-2025-5802

The self-registration flow accepts user-supplied input for usernames without adequately preventing the disclosure of username existence. When a user attempts to register with an existing username, the system responds with an error message that explicitly indicates the username is already in use. This behavior allows an attacker to discover valid usernames within the system. The discovery of valid usernames can facilitate subsequent attacks such as brute force, social engineering, and targeted phishing campaigns.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4227/

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-15 10:17

Updated : 2026-09-15 13:16

NVD link : CVE-2025-5802

Mitre link : CVE-2025-5802

CVE.ORG link : CVE-2025-5802

JSON object : View

Products Affected

No product.

CWE

CWE-203

Observable Discrepancy

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"version": "7.1.0", "lessThan": "7.1.0.41", "versionType": "custom"}, {"status": "affected", "version": "7.2.0", "lessThan": "7.2.0.3", "versionType": "custom"}], "defaultStatus": "unaffected"}, {"vendor": "WSO2", "product": "WSO2 Identity Server as Key Manager", "versions": [{"status": "unknown", "version": "0", "lessThan": "5.10.0", "versionType": "custom"}, {"status": "affected", "version": "5.10.0", "lessThan": "5.10.0.374", "versionType": "custom"}], "defaultStatus": "unaffected"}, {"vendor": "WSO2", "product": "WSO2 Open Banking AM", "versions": [{"status": "unknown", "version": "0", "lessThan": "2.0.0", "versionType": "custom"}, {"status": "affected", "version": "2.0.0", "lessThan": "2.0.0.403", "versionType": "custom"}], "defaultStatus": "unaffected"}, {"vendor": "WSO2", "product": "WSO2 Open Banking IAM", "versions": [{"status": "unknown", "version": "0", "lessThan": "2.0.0", "versionType": "custom"}, {"status": "affected", "version": "2.0.0", "lessThan": "2.0.0.423", "versionType": "custom"}], "defaultStatus": "unaffected"}, {"vendor": "WSO2", "product": "WSO2 Carbon Identity Management Endpoint Util", "versions": [{"status": "affected", "version": "5.17.5", "lessThan": "5.17.5.332", "versionType": "custom"}, {"status": "affected", "version": "5.18.187", "lessThan": "5.18.187.330", "versionType": "custom"}, {"status": "affected", "version": "5.23.8", "lessThan": "5.23.8.213", "versionType": "custom"}, {"status": "affected", "version": "5.25.92", "lessThan": "5.25.92.167", "versionType": "custom"}, {"status": "affected", "version": "7.0.78", "lessThan": "7.0.78.162", "versionType": "custom"}, {"status": "unaffected", "version": "x", "versionType": "custom", "lessThanOrEqual": "*"}], "packageName": "org.wso2.carbon.identity.framework:org.wso2.carbon.identity.mgt.endpoint.util", "defaultStatus": "unknown"}, {"vendor": "WSO2", "product": "WSO2 Carbon Identity Application Authentication Framework", "versions": [{"status": "affected", "version": 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When a user attempts to register with an existing username, the system responds with an error message that explicitly indicates the username is already in use.\n\nThis behavior allows an attacker to discover valid usernames within the system. The discovery of valid usernames can facilitate subsequent attacks such as brute force, social engineering, and targeted phishing campaigns."}], "lastModified": "2026-09-15T13:16:40.277", "sourceIdentifier": "ed10eef1-636d-4fbe-9993-6890dfa878f8"}