CVE-2025-13736
Username Enumeration via Login Interface in Multiple WSO2 Products Allows User Account Discovery
Description
When Multi-Attribute Login is enabled, the login interface fails to consistently mask the existence of user accounts. For valid users, the server resolves and displays their canonical username, while for non-existent users, it echoes the original input. This occurs regardless of the validate_username configuration. The discovery of valid usernames can increase the risk of brute force attacks, social engineering attacks, and targeted information leakage. Attackers can leverage this information to craft more effective phishing campaigns or social engineering tactics to compromise user accounts or extract sensitive data.
INFO
Published Date :
Aug. 6, 2026, 8:16 a.m.
Last Modified :
Aug. 6, 2026, 8:16 a.m.
Remotely Exploit :
Yes !
Source :
ed10eef1-636d-4fbe-9993-6890dfa878f8
Affected Products
The following products are affected by CVE-2025-13736
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | LOW | ed10eef1-636d-4fbe-9993-6890dfa878f8 | ||||
| CVSS 3.1 | LOW | MITRE-CVE |
Solution
- Ensure login responses do not reveal username validity.
- Implement consistent error messages for all login attempts.
- Disable or reconfigure Multi-Attribute Login if applicable.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-13736.
| URL | Resource |
|---|---|
| https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4013/ |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-13736 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-13736
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-13736 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-13736 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by ed10eef1-636d-4fbe-9993-6890dfa878f8
Aug. 06, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'WSO2', 'product': 'WSO2 Identity Server as Key Manager', 'versions': [{'status': 'unknown', 'version': '0', 'lessThan': '5.10.0', 'versionType': 'custom'}, {'status': 'affected', 'version': '5.10.0', 'lessThan': '5.10.0.371', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}, {'vendor': 'WSO2', 'product': 'WSO2 Identity Server', 'versions': [{'status': 'unknown', 'version': '0', 'lessThan': '5.10.0', 'versionType': 'custom'}, {'status': 'affected', 'version': '5.10.0', 'lessThan': '5.10.0.380', 'versionType': 'custom'}, {'status': 'affected', 'version': '5.11.0', 'lessThan': '5.11.0.427', 'versionType': 'custom'}, {'status': 'affected', 'version': '6.0.0', 'lessThan': '6.0.0.254', 'versionType': 'custom'}, {'status': 'affected', 'version': '6.1.0', 'lessThan': '6.1.0.255', 'versionType': 'custom'}, {'status': 'affected', 'version': '7.0.0', 'lessThan': '7.0.0.132', 'versionType': 'custom'}, {'status': 'affected', 'version': '7.1.0', 'lessThan': '7.1.0.40', 'versionType': 'custom'}, {'status': 'affected', 'version': '7.2.0', 'lessThan': '7.2.0.2', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}, {'vendor': 'WSO2', 'product': 'WSO2 Open Banking AM', 'versions': [{'status': 'unknown', 'version': '0', 'lessThan': '2.0.0', 'versionType': 'custom'}, {'status': 'affected', 'version': '2.0.0', 'lessThan': '2.0.0.400', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}, {'vendor': 'WSO2', 'product': 'WSO2 API Manager', 'versions': [{'status': 'unknown', 'version': '0', 'lessThan': '3.1.0', 'versionType': 'custom'}, {'status': 'affected', 'version': '3.1.0', 'lessThan': '3.1.0.351', 'versionType': 'custom'}, {'status': 'affected', 'version': '3.2.0', 'lessThan': '3.2.0.455', 'versionType': 'custom'}, {'status': 'affected', 'version': '4.0.0', 'lessThan': '4.0.0.375', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}, {'vendor': 'WSO2', 'product': 'WSO2 Open Banking IAM', 'versions': [{'status': 'unknown', 'version': '0', 'lessThan': '2.0.0', 'versionType': 'custom'}, {'status': 'affected', 'version': '2.0.0', 'lessThan': '2.0.0.420', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}] Added Description When Multi-Attribute Login is enabled, the login interface fails to consistently mask the existence of user accounts. For valid users, the server resolves and displays their canonical username, while for non-existent users, it echoes the original input. This occurs regardless of the validate_username configuration. The discovery of valid usernames can increase the risk of brute force attacks, social engineering attacks, and targeted information leakage. Attackers can leverage this information to craft more effective phishing campaigns or social engineering tactics to compromise user accounts or extract sensitive data. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N Added CWE CWE-203 Added Reference https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4013/