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Vulnerability Assessment

Weakness
CWE
ASVS 5.0
V6 - Authentication Response uniformity
Impact

CVSS score of 5.3 (MEDIUM). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. EPSS exploitation probability: 0.02%.

Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the medium-severity affected system.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAI

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. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affected VersionsENISA

WSO2 Carbon Authenticator Library For EmailOTP 4.1.0 <4.1.0.8
WSO2 Identity Server 5.10.0 <5.10.0.379
WSO2 Identity Server as Key Manager 5.10.0 <5.10.0.267
WSO2 Identity Server 5.11.0 <5.11.0.426
WSO2 Identity Server 5.11.0 <5.11.0.431
WSO2 Identity Server 7.0.0 <7.0.0.131
WSO2 Carbon Authenticator Library For EmailOTP 3.0.26 <3.0.26.16
WSO2 Open Banking IAM 2.0.0 <2.0.0.318
WSO2 Carbon Authenticator Library For EmailOTP 3.0.24 <3.0.24.6
Email OTP Authenticator 1.0.18 <1.0.18.7
WSO2 Identity Server 6.0.0 <6.0.0.253
WSO2 Carbon Authenticator Library For EmailOTP 3.0.5 <3.0.5.8
WSO2 Carbon Authenticator Library For EmailOTP 4.1.4 <4.1.4.9
WSO2 Identity Server 6.1.0 <6.1.0.254

Affected Packages

euvd email_otp_authenticator fix: 1.0.18.7
euvd wso2_carbon_authenticator_library_for_emailotp fix: 3.0.5.8, 3.0.24.6, 3.0.26.16, 4.1.0.8, 4.1.4.9
euvd wso2_identity_server fix: 5.10.0.379, 5.11.0.426, 5.11.0.431, 6.0.0.253, 6.1.0.254, 7.0.0.131
euvd wso2_identity_server_as_key_manager fix: 5.10.0.267
euvd wso2_open_banking_iam fix: 2.0.0.318

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 5 packages in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified under CWE-204. 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 products include: Wso2 Wso2 Identity Server, Wso2 Wso2 Open Banking Iam, Wso2 Wso2 Identity Server As Key Manager, Wso2 Email Otp Authenticator, Wso2 Wso2 Carbon Authenticator Library For Emailotp.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

2
Patch available
May 11, 2026 - 11:01 EUVD
CVE Published
May 11, 2026 - 08:45 cve.org
MEDIUM 5.3

DescriptionCVE.org

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.

Threat Intelligence Overview

EPSS Score
0.0%
Top 93% exploitable
Social Media
1
Sightings
Data Quality
5 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
Yes
Human Impact· derived
Medium
Technical Impact
Partial

Priority Score

26
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +26
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

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