FKIE_CVE-2025-5802
Vulnerability from fkie_nvd - Published: 2026-09-15 10:17 - Updated: 2026-09-15 13:16
Severity
Summary
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.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "WSO2 API Manager",
"vendor": "WSO2",
"versions": [
{
"lessThan": "3.1.0",
"status": "unknown",
"version": "0",
"versionType": "custom"
},
{
"lessThan": "3.1.0.354",
"status": "affected",
"version": "3.1.0",
"versionType": "custom"
},
{
"lessThan": "3.2.0.458",
"status": "affected",
"version": "3.2.0",
"versionType": "custom"
},
{
"lessThan": "3.2.0.478",
"status": "affected",
"version": "3.2.0",
"versionType": "custom"
},
{
"lessThan": "3.2.1.96",
"status": "affected",
"version": "3.2.1",
"versionType": "custom"
},
{
"lessThan": "4.0.0.379",
"status": "affected",
"version": "4.0.0",
"versionType": "custom"
},
{
"lessThan": "4.1.0.262",
"status": "affected",
"version": "4.1.0",
"versionType": "custom"
},
{
"lessThan": "4.2.0.200",
"status": "affected",
"version": "4.2.0",
"versionType": "custom"
},
{
"lessThan": "4.3.0.112",
"status": "affected",
"version": "4.3.0",
"versionType": "custom"
},
{
"lessThan": "4.4.0.72",
"status": "affected",
"version": "4.4.0",
"versionType": "custom"
},
{
"lessThan": "4.5.0.55",
"status": "affected",
"version": "4.5.0",
"versionType": "custom"
},
{
"lessThan": "4.6.0.17",
"status": "affected",
"version": "4.6.0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "WSO2 API Control Plane",
"vendor": "WSO2",
"versions": [
{
"lessThan": "4.5.0",
"status": "unknown",
"version": "0",
"versionType": "custom"
},
{
"lessThan": "4.5.0.56",
"status": "affected",
"version": "4.5.0",
"versionType": "custom"
},
{
"lessThan": "4.6.0.18",
"status": "affected",
"version": "4.6.0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "WSO2 Universal Gateway",
"vendor": "WSO2",
"versions": [
{
"lessThan": "4.5.0",
"status": "unknown",
"version": "0",
"versionType": "custom"
},
{
"lessThan": "4.5.0.55",
"status": "affected",
"version": "4.5.0",
"versionType": "custom"
},
{
"lessThan": "4.6.0.17",
"status": "affected",
"version": "4.6.0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "WSO2 Traffic Manager",
"vendor": "WSO2",
"versions": [
{
"lessThan": "4.5.0",
"status": "unknown",
"version": "0",
"versionType": "custom"
},
{
"lessThan": "4.5.0.54",
"status": "affected",
"version": "4.5.0",
"versionType": "custom"
},
{
"lessThan": "4.6.0.17",
"status": "affected",
"version": "4.6.0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "WSO2 Identity Server",
"vendor": "WSO2",
"versions": [
{
"lessThan": "5.10.0",
"status": "unknown",
"version": "0",
"versionType": "custom"
},
{
"lessThan": "5.10.0.383",
"status": "affected",
"version": "5.10.0",
"versionType": "custom"
},
{
"lessThan": "5.11.0.430",
"status": "affected",
"version": "5.11.0",
"versionType": "custom"
},
{
"lessThan": "6.0.0.257",
"status": "affected",
"version": "6.0.0",
"versionType": "custom"
},
{
"lessThan": "6.1.0.234",
"status": "affected",
"version": "6.1.0",
"versionType": "custom"
},
{
"lessThan": "6.1.0.257",
"status": "affected",
"version": "6.1.0",
"versionType": "custom"
},
{
"lessThan": "7.0.0.133",
"status": "affected",
"version": "7.0.0",
"versionType": "custom"
},
{
"lessThan": "7.1.0.41",
"status": "affected",
"version": "7.1.0",
"versionType": "custom"
},
{
"lessThan": "7.2.0.3",
"status": "affected",
"version": "7.2.0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "WSO2 Identity Server as Key Manager",
"vendor": "WSO2",
"versions": [
{
"lessThan": "5.10.0",
"status": "unknown",
"version": "0",
"versionType": "custom"
},
{
"lessThan": "5.10.0.374",
"status": "affected",
"version": "5.10.0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "WSO2 Open Banking AM",
"vendor": "WSO2",
"versions": [
{
"lessThan": "2.0.0",
"status": "unknown",
"version": "0",
"versionType": "custom"
},
{
"lessThan": "2.0.0.403",
"status": "affected",
"version": "2.0.0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "WSO2 Open Banking IAM",
"vendor": "WSO2",
"versions": [
{
"lessThan": "2.0.0",
"status": "unknown",
"version": "0",
"versionType": "custom"
},
{
"lessThan": "2.0.0.423",
"status": "affected",
"version": "2.0.0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"packageName": "org.wso2.carbon.identity.framework:org.wso2.carbon.identity.mgt.endpoint.util",
"product": "WSO2 Carbon Identity Management Endpoint Util",
"vendor": "WSO2",
"versions": [
{
"lessThan": "5.17.5.332",
"status": "affected",
"version": "5.17.5",
"versionType": "custom"
},
{
"lessThan": "5.18.187.330",
"status": "affected",
"version": "5.18.187",
"versionType": "custom"
},
{
"lessThan": "5.23.8.213",
"status": "affected",
"version": "5.23.8",
"versionType": "custom"
},
{
"lessThan": "5.25.92.167",
"status": "affected",
"version": "5.25.92",
"versionType": "custom"
},
{
"lessThan": "7.0.78.162",
"status": "affected",
"version": "7.0.78",
"versionType": "custom"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "x",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"packageName": "org.wso2.carbon.identity.framework:org.wso2.carbon.identity.application.authentication.framework",
"product": "WSO2 Carbon Identity Application Authentication Framework",
"vendor": "WSO2",
"versions": [
{
"lessThan": "5.17.5.332",
"status": "affected",
"version": "5.17.5",
"versionType": "custom"
},
{
"lessThan": "5.18.187.330",
"status": "affected",
"version": "5.18.187",
"versionType": "custom"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "x",
"versionType": "custom"
}
]
}
],
"source": "ed10eef1-636d-4fbe-9993-6890dfa878f8"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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.\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."
}
],
"id": "CVE-2025-5802",
"lastModified": "2026-09-15T13:16:40.277",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 1.4,
"source": "ed10eef1-636d-4fbe-9993-6890dfa878f8",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2025-5802",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-15T12:48:59.851340Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-09-15T10:17:02.640",
"references": [
{
"source": "ed10eef1-636d-4fbe-9993-6890dfa878f8",
"url": "https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4227/"
}
],
"sourceIdentifier": "ed10eef1-636d-4fbe-9993-6890dfa878f8",
"vulnStatus": "Received",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-203"
}
],
"source": "ed10eef1-636d-4fbe-9993-6890dfa878f8",
"type": "Secondary"
}
]
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…