CVE-2024-0391

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

MEDIUM

4.3

CVSS Score

Published: May 11, 2026 at 08:45 AM UTC

Updated: June 17, 2026 at 06:53 AM UTC

4 products affected across 1 vendorIdentity ServerIdentity Server As Key ManagerOpen Banking IAM

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Severity

MEDIUM4.3

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Identity Server · WSO2

95%

5.10.0 ≤ v < 5.10.0.3795.11.0 ≤ v < 5.11.0.4265.11.0 ≤ v < 5.11.0.4316.0.0 ≤ v < 6.0.0.2536.1.0 ≤ v < 6.1.0.2547.0.0 ≤ v < 7.0.0.1315.10.0 5.11.0 6.0.0 6.1.0 7.0.0

Affected range stops below 5.10.0.379, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.11.0.426, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.11.0.431, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.0.0.253, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.1.0.254, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.0.0.131, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 5.10.0 (unknown)

Identity Server As Key Manager · WSO2

95%

5.10.0 ≤ v < 5.10.0.2675.10.0 ≤ v < 5.10.2675.10.0

Affected range stops below 5.10.0.267, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 5.10.0 (unknown)

Open Banking IAM · WSO2

95%

2.0.0 ≤ v < 2.0.0.3182.0.0

Affected range stops below 2.0.0.318, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 2.0.0 (unknown)

Email OTP Authenticator · WSO2

60%

1.0.18 ≤ v < 1.0.18.73.0.24 ≤ v < 3.0.24.63.0.26 ≤ v < 3.0.26.163.0.5 ≤ v < 3.0.5.84.1.0 ≤ v < 4.1.0.84.1.4 ≤ v < 4.1.4.91.0.18 3.0.24 3.0.26 3.0.5 4.1.0 4.1.4

Affected range stops below 1.0.18.7, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 1.0.24 (unaffected)

Affected range stops below 3.0.24.6, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.0.26.16, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.0.5.8, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.1.0.8, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 4.1.22 (unaffected)

Affected range stops below 4.1.4.9, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2024-3115/

References (1)

Vendor Advisory

Source: cverecord

https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2024-3115/

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.3MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: LOW
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-204

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