Vulnerability-Lookup

CVE-2024-0391 (GCVE-0-2024-0391)

Vulnerability from cvelistv5 – Published: 2026-05-11 08:45 – Updated: 2026-05-11 12:46

Title

Username Enumeration via Email OTP Flow in Multiple WSO2 Products Allows User Account Discovery

Summary

The check user account lock states feature within the email OTP flow fails to validate user input, allowing an attacker to infer the existence of registered user accounts. The discovery of valid usernames can increase the risk of brute-force and social engineering attacks. Attackers can leverage this information to craft targeted phishing campaigns or other malicious activities aimed at tricking users into divulging sensitive data, potentially damaging the organization's reputation and leading to regulatory non-compliance and financial consequences.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-11 12:45 UTC

CWE

CWE-204 - Observable response discrepancy

Assigner

WSO2 CNA under the mitre root

CNA scorecard B 89/100 over 68 records in the last 180 days details

References

1 reference

URL	Tags
https://security.docs.wso2.com/en/latest/security…	vendor-advisory

Impacted products

6 products

Vendor	Product	Version
WSO2	WSO2 Identity Server	Unknown: 0 , < 5.10.0 (custom) Affected: 5.10.0 , < 5.10.0.379 (custom) Affected: 5.11.0 , < 5.11.0.426 (custom) Affected: 5.11.0 , < 5.11.0.431 (custom) Affected: 6.0.0 , < 6.0.0.253 (custom) Affected: 6.1.0 , < 6.1.0.254 (custom) Affected: 7.0.0 , < 7.0.0.131 (custom) cpe:2.3:a:wso2:wso2_identity_server:::::::: cpe:2.3:a:wso2:wso2_identity_server:::::::: cpe:2.3:a:wso2:wso2_identity_server:::::::: cpe:2.3:a:wso2:wso2_identity_server:::::::: cpe:2.3:a:wso2:wso2_identity_server:::::::: cpe:2.3:a:wso2:wso2_identity_server::::::::
WSO2	WSO2 Open Banking IAM	Unknown: 0 , < 2.0.0 (custom) Affected: 2.0.0 , < 2.0.0.318 (custom) cpe:2.3:a:wso2:wso2_open_banking_iam::::::::
WSO2	WSO2 Identity Server as Key Manager	Unknown: 0 , < 5.10.0 (custom) Affected: 5.10.0 , < 5.10.0.267 (custom) cpe:2.3:a:wso2:wso2_identity_server_as_key_manager::::::::
WSO2	Email OTP Authenticator	Affected: 1.0.18 , < 1.0.18.7 (custom) Unaffected: 1.0.24 , ≤ * (custom) cpe:2.3:a:wso2:email_otp_authenticator::::::::
WSO2	WSO2 Carbon Authenticator Library For EmailOTP	Affected: 4.1.0 , < 4.1.0.8 (custom) Affected: 4.1.4 , < 4.1.4.9 (custom) Unaffected: 4.1.22 , ≤ * (custom) cpe:2.3:a:wso2:wso2_carbon_authenticator_library_for_emailotp:::::::: cpe:2.3:a:wso2:wso2_carbon_authenticator_library_for_emailotp::::::::
WSO2	WSO2 Carbon Authenticator Library For EmailOTP	Affected: 3.0.5 , < 3.0.5.8 (custom) Affected: 3.0.24 , < 3.0.24.6 (custom) Affected: 3.0.26 , < 3.0.26.16 (custom) cpe:2.3:a:wso2:wso2_carbon_authenticator_library_for_emailotp:::::::: cpe:2.3:a:wso2:wso2_carbon_authenticator_library_for_emailotp:::::::: cpe:2.3:a:wso2:wso2_carbon_authenticator_library_for_emailotp::::::::

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FKIE_CVE-2024-0391

Vulnerability from fkie_nvd - Published: 2026-05-11 10:16 - Updated: 2026-11-08 20:10

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Summary

References

	URL	Tags
	ed10eef1-636d-4fbe-9993-6890dfa878f8	https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2024-3115/	Vendor Advisory

Impacted products

Vendor	Product	Version
wso2	identity_server	*
wso2	identity_server	*
wso2	identity_server	*
wso2	identity_server	*
wso2	identity_server	*
wso2	identity_server_as_key_manager	*
wso2	open_banking_iam	*

JSON

To clipboard

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The check user account lock states feature within the email OTP flow fails to validate user input, allowing an attacker to infer the existence of registered user accounts.\n\nThe discovery of valid usernames can increase the risk of brute-force and social engineering attacks. Attackers can leverage this information to craft targeted phishing campaigns or other malicious activities aimed at tricking users into divulging sensitive data, potentially damaging the organization\u0027s reputation and leading to regulatory non-compliance and financial consequences."
    },
    {
      "lang": "es",
      "value": "La funci\u00f3n de verificaci\u00f3n de estados de bloqueo de cuentas de usuario dentro del flujo de OTP por correo electr\u00f3nico no valida la entrada del usuario, permitiendo a un atacante inferir la existencia de cuentas de usuario registradas.\n\nEl descubrimiento de nombres de usuario v\u00e1lidos puede aumentar el riesgo de ataques de fuerza bruta e ingenier\u00eda social. Los atacantes pueden aprovechar esta informaci\u00f3n para elaborar campa\u00f1as de phishing dirigidas u otras actividades maliciosas destinadas a enga\u00f1ar a los usuarios para que divulguen datos sensibles, da\u00f1ando potencialmente la reputaci\u00f3n de la organizaci\u00f3n y provocando el incumplimiento normativo y consecuencias financieras."
    }
  ],
  "id": "CVE-2024-0391",
  "lastModified": "2026-11-08T20:10:00.187",
  "metrics": {
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          "attackVector": "NETWORK",
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      "type": "Secondary"
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  ]
}

GHSA-R9X2-MG2V-MQ96

Vulnerability from github – Published: 2026-05-11 12:32 – Updated: 2026-05-11 12:32

Details

The check user account lock states feature within the email OTP flow fails to validate user input, allowing an attacker to infer the existence of registered user accounts.

The discovery of valid usernames can increase the risk of brute-force and social engineering attacks. Attackers can leverage this information to craft targeted phishing campaigns or other malicious activities aimed at tricking users into divulging sensitive data, potentially damaging the organization's reputation and leading to regulatory non-compliance and financial consequences.

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2024-0391"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-204"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-11T10:16:11Z",
    "severity": "MODERATE"
  },
  "details": "The check user account lock states feature within the email OTP flow fails to validate user input, allowing an attacker to infer the existence of registered user accounts.\n\nThe discovery of valid usernames can increase the risk of brute-force and social engineering attacks. Attackers can leverage this information to craft targeted phishing campaigns or other malicious activities aimed at tricking users into divulging sensitive data, potentially damaging the organization\u0027s reputation and leading to regulatory non-compliance and financial consequences.",
  "id": "GHSA-r9x2-mg2v-mq96",
  "modified": "2026-05-11T12:32:31Z",
  "published": "2026-05-11T12:32:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-0391"
    },
    {
      "type": "WEB",
      "url": "https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2024-3115"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GSD-2024-0391

Vulnerability from gsd - Updated: 2024-01-11 06:02

Details

** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided.

Aliases

CVE-2024-0391

JSON

To clipboard

{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
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        "CVE-2024-0391"
      ],
      "id": "GSD-2024-0391",
      "modified": "2024-01-11T06:02:11.030389Z",
      "schema_version": "1.4.0"
    }
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        "ID": "CVE-2024-0391",
        "STATE": "RESERVED"
      },
      "data_format": "MITRE",
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      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided."
          }
        ]
      }
    }
  }
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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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.

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.

Action not permitted

CVE-2024-0391 (GCVE-0-2024-0391)

FKIE_CVE-2024-0391

GHSA-R9X2-MG2V-MQ96

GSD-2024-0391

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour