CVE-2024-7478

Username Enumeration via External User Stores in Multiple WSO2 Products Allows User Account Discovery

Published Oct 21, 2026 CVSS 3.1 · 5.8 Medium EPSS < 1% KEV · Not listed

Description

When a WSO2 product is configured to use an external user store, the system fails to adequately obscure the existence or validity of usernames during authentication attempts. This oversight allows an attacker to repeatedly query the authentication mechanism with different username guesses, enabling the enumeration of valid usernames present in the external user store.

The discovery of valid usernames can increase the risk of targeted brute-force attacks, social engineering, and information leakage. Attackers can leverage this information to craft more convincing phishing campaigns or other social engineering tactics to trick users into revealing sensitive data. The presence of username enumeration could also negatively impact an organization's reputation, leading to loss of customer trust, regulatory non-compliance, and potential legal and financial repercussions.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

WSO2

WSO2 API Manager

unaffected

Version	Status	Constraints
`0`	unknown	< 3.1.0
`3.1.0`	affected	< 3.1.0.310
`3.2.0`	affected	< 3.2.0.401
`3.2.1`	affected	< 3.2.1.26
`4.0.0`	affected	< 4.0.0.318
`4.1.0`	affected	< 4.1.0.180
`4.2.0`	affected	< 4.2.0.119
`4.3.0`	affected	< 4.3.0.30

WSO2

WSO2 Identity Server as Key Manager

unaffected

Version	Status	Constraints
`0`	unknown	< 5.10.0
`5.10.0`	affected	< 5.10.0.320

WSO2

WSO2 Identity Server

unaffected

Version	Status	Constraints
`0`	unknown	< 5.10.0
`5.10.0`	affected	< 5.10.0.326
`6.0.0`	affected	< 6.0.0.214
`6.1.0`	affected	< 6.1.0.198
`7.0.0`	affected	< 7.0.0.67

WSO2

WSO2 Open Banking IAM

unaffected

Version	Status	Constraints
`0`	unknown	< 2.0.0
`2.0.0`	affected	< 2.0.0.371

WSO2

WSO2 Open Banking AM

unaffected

Version	Status	Constraints
`0`	unknown	< 2.0.0
`2.0.0`	affected	< 2.0.0.351

WSO2

WSO2 Carborn Identity Handler

unknown

Version	Status	Constraints
`1.4.0`	affected	< 1.4.0.15
`1.4.0`	affected	< 1.4.0.16
`1.4.11`	affected	< 1.4.11.14
`1.4.37`	affected	< 1.4.37.1
`1.6.1`	affected	< 1.6.1.5
`1.7.1`	affected	< 1.7.1.1
`1.8.6`	affected	< 1.8.6.5
`1.8.14`	affected	< 1.8.14.1
`1.9.2`	affected	< 1.9.2.4

No data.

Vendor Product Versions

Wso2

Identity Server

Version	Status	Scheme	Platform
`[5.10.0,5.10.0.326)`	affected	generic	—
`[6.0.0,6.0.0.214)`	affected	generic	—
`[6.1.0,6.1.0.198)`	affected	generic	—
`[7.0.0,7.0.0.67)`	affected	generic	—

Wso2

Wso2 Api Manager

Version	Status	Scheme	Platform
`[3.1.0,3.1.0.310)`	affected	generic	—
`[3.2.0,3.2.0.401)`	affected	generic	—
`[3.2.1,3.2.1.26)`	affected	generic	—
`[4.0.0,4.0.0.318)`	affected	generic	—
`[4.1.0,4.1.0.180)`	affected	generic	—
`[4.2.0,4.2.0.119)`	affected	generic	—
`[4.3.0,4.3.0.30)`	affected	generic	—

Wso2

Wso2 Carborn Identity Handler

Version	Status	Scheme	Platform
`[1.4.0,1.4.0.15)`	affected	generic	—
`[1.4.0,1.4.0.16)`	affected	generic	—
`[1.4.11,1.4.11.14)`	affected	generic	—
`[1.4.37,1.4.37.1)`	affected	generic	—
`[1.6.1,1.6.1.5)`	affected	generic	—
`[1.7.1,1.7.1.1)`	affected	generic	—
`[1.8.6,1.8.6.5)`	affected	generic	—
`[1.8.14,1.8.14.1)`	affected	generic	—
`[1.9.2,1.9.2.4)`	affected	generic	—

Wso2

Wso2 Identity Server

Version	Status	Scheme	Platform
`[5.10.0,5.10.0.326)`	affected	generic	—
`[6.0.0,6.0.0.214)`	affected	generic	—
`[6.1.0,6.1.0.198)`	affected	generic	—
`[7.0.0,7.0.0.67)`	affected	generic	—

Wso2

Wso2 Identity Server As Key Manager

Version	Status	Scheme	Platform
`[5.10.0,5.10.0.320)`	affected	generic	—

Wso2

Wso2 Open Banking Am

Version	Status	Scheme	Platform
`[2.0.0,2.0.0.351)`	affected	generic	—

Wso2

Wso2 Open Banking Iam

Version	Status	Scheme	Platform
`[2.0.0,2.0.0.371)`	affected	generic	—

Remediation

Vendor Solution

Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2024-3606/#solution

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.235% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2024-3606/

History

Oct 30, 2026 7:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Oct 22, 2026 1:45 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Wso2 identity Server
Vendors & Products		Wso2 identity Server

Oct 21, 2026 2:00 PM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		When a WSO2 product is configured to use an external user store, the system fails to adequately obscure the existence or validity of usernames during authentication attempts. This oversight allows an attacker to repeatedly query the authentication mechanism with different username guesses, enabling the enumeration of valid usernames present in the external user store. The discovery of valid usernames can increase the risk of targeted brute-force attacks, social engineering, and information leakage. Attackers can leverage this information to craft more convincing phishing campaigns or other social engineering tactics to trick users into revealing sensitive data. The presence of username enumeration could also negatively impact an organization's reputation, leading to loss of customer trust, regulatory non-compliance, and potential legal and financial repercussions.
Title		Username Enumeration via External User Stores in Multiple WSO2 Products Allows User Account Discovery
First Time appeared		Wso2 Wso2 wso2 Api Manager Wso2 wso2 Carborn Identity Handler Wso2 wso2 Identity Server Wso2 wso2 Identity Server As Key Manager Wso2 wso2 Open Banking Am Wso2 wso2 Open Banking Iam
Weaknesses		CWE-204
CPEs		cpe:2.3:a:wso2:wso2_api_manager:::::::: cpe:2.3:a:wso2:wso2_carborn_identity_handler:::::::: cpe:2.3:a:wso2:wso2_identity_server:::::::: cpe:2.3:a:wso2:wso2_identity_server_as_key_manager:::::::: cpe:2.3:a:wso2:wso2_open_banking_am:::::::: cpe:2.3:a:wso2:wso2_open_banking_iam::::::::
Vendors & Products		Wso2 Wso2 wso2 Api Manager Wso2 wso2 Carborn Identity Handler Wso2 wso2 Identity Server Wso2 wso2 Identity Server As Key Manager Wso2 wso2 Open Banking Am Wso2 wso2 Open Banking Iam
References		https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2024-3606/
Metrics		cvssV3_1 `{'score': 5.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N'}`

Subscriptions

Wso2 Identity Server Wso2 Api Manager Wso2 Carborn Identity Handler Wso2 Identity Server Wso2 Identity Server As Key Manager Wso2 Open Banking Am Wso2 Open Banking Iam

Weaknesses