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🛡️ CVE-2025-13736 — api-manager

🟢 CVSS 3.7 — Low ✅ No Known Exploit CWE-203 NVD
3.7
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: Low — limited, and the attacker does not choose what is affected.
  • Integrity impact: None.
  • Availability impact: None.

Weakness class

CVE-2025-13736 is classified as CWE-203: Observable Discrepancy. The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.

Affected software

CVE-2025-13736 is recorded against 5 packages.

  • api-manager (from 4.0.0 up to 4.0.0.375)
  • identity-server (from 7.2.0 up to 7.2.0.2)
  • identity-server-as-key-manager (from 5.10.0 up to 5.10.0.371)
  • open-banking-am (from 2.0.0 up to 2.0.0.400)
  • open-banking-iam (from 2.0.0 up to 2.0.0.420)

Timeline and source

Published on 6 August 2026 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

security.docs.wso2.com

Other advisories for this package

api-manager has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-203: Observable Discrepancy) in other software:

Details

Severity LOW
CVSS Score 3.7
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE CWE-203
Public Exploit ✅ No
Source NVD
Published 2026-08-06
Updated 2026-08-20
Modified 2026-08-12
Fix URL N/A

Affected Packages

Software From version Fixed in
api-manager 4.0.0 4.0.0.375
identity-server 7.2.0 7.2.0.2
identity-server-as-key-manager 5.10.0 5.10.0.371
open-banking-am 2.0.0 2.0.0.400
open-banking-iam 2.0.0 2.0.0.420

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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