CVE-2025-13736

Username Enumeration via Login Interface in Multiple WSO2 Products Allows User Account Discovery

LOW

3.7

CVSS Score

Published: August 6, 2026 at 07:33 AM UTC

Updated: September 29, 2026 at 02:10 PM UTC

5 products affected across 1 vendorAPI ManagerIdentity ServerIdentity Server As Key Manager

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Severity

LOW3.7

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

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.

Affected

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

API Manager · WSO2

95%

3.1.0 ≤ v < 3.1.0.3513.2.0 ≤ v < 3.2.0.4554.0.0 ≤ v < 4.0.0.3753.1.0 3.2.0 4.0.0

Affected range stops below 3.1.0.351, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.2.0.455, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.0.0.375, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 3.1.0 (unknown)

Identity Server · WSO2

95%

5.10.0 ≤ v < 5.10.0.3805.11.0 ≤ v < 5.11.0.4276.0.0 ≤ v < 6.0.0.2546.1.0 ≤ v < 6.1.0.2557.0.0 ≤ v < 7.0.0.1327.1.0 ≤ v < 7.1.0.407.2.0 ≤ v < 7.2.0.25.10.0 5.11.0 6.0.0 6.1.0 7.0.0 7.1.0 7.2.0

Affected range stops below 5.10.0.380, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.11.0.427, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.0.0.254, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.1.0.255, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.0.0.132, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.1.0.40, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.2.0.2, 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 < 5.10.0.3715.10.0

Affected range stops below 5.10.0.371, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 5.10.0 (unknown)

Open Banking Am · WSO2

95%

2.0.0 ≤ v < 2.0.0.4002.0.0

Affected range stops below 2.0.0.400, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 2.0.0 (unknown)

Open Banking IAM · WSO2

95%

2.0.0 ≤ v < 2.0.0.4202.0.0

Affected range stops below 2.0.0.420, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 2.0.0 (unknown)

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/WSO2-2025-4013/

References (1)

Vendor Advisory

Source: cverecord

https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4013/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

3.7LOWWSO2

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

Vector?

Quick Info

StatusANALYZED

CWE

CWE-203

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