MediumCVE-2025-5802

    WSO2 API Manager: Observable Discrepancy (CVE-2025-5802)

    Published Last modified Sources: CVE.org

    What is affected, what to do

    The self-registration flow accepts user-supplied input for usernames without adequately preventing the disclosure of username existence. When a user attempts to register with an existing username, the system responds with an error message that explicitly indicates the username is already in use.

    Update WSO2 Identity Server to version 6.1.0.234, WSO2 API Manager to version 3.1.0.354, WSO2 API Manager to version 3.2.0.458.

    Affected
    • WSO2 Identity Server lt 6.1.0..6.1.0.234
    • WSO2 API Manager lt 3.1.0..3.1.0.354
    • WSO2 API Manager lt 3.2.0..3.2.0.458
    • WSO2 API Manager lt 3.2.0..3.2.0.478
    • WSO2 API Manager lt 3.2.1..3.2.1.96
    • WSO2 API Manager lt 4.0.0..4.0.0.379
    • WSO2 API Manager lt 4.1.0..4.1.0.262
    • WSO2 API Manager lt 4.2.0..4.2.0.200
    • WSO2 API Manager lt 4.3.0..4.3.0.112
    • WSO2 API Manager lt 4.4.0..4.4.0.72
    • WSO2 API Manager lt 4.5.0..4.5.0.55
    • WSO2 API Manager lt 4.6.0..4.6.0.17
    • WSO2 API Control Plane lt 4.5.0..4.5.0.56
    • WSO2 API Control Plane lt 4.6.0..4.6.0.18
    • WSO2 Universal Gateway lt 4.5.0..4.5.0.55
    • WSO2 Universal Gateway lt 4.6.0..4.6.0.17
    • WSO2 Traffic Manager lt 4.5.0..4.5.0.54
    • WSO2 Traffic Manager lt 4.6.0..4.6.0.17
    • WSO2 Identity Server lt 5.10.0..5.10.0.383
    • WSO2 Identity Server lt 5.11.0..5.11.0.430
    • WSO2 Identity Server lt 6.0.0..6.0.0.257
    • WSO2 Identity Server lt 6.1.0..6.1.0.257
    • WSO2 Identity Server lt 7.0.0..7.0.0.133
    • WSO2 Identity Server lt 7.1.0..7.1.0.41
    • WSO2 Identity Server lt 7.2.0..7.2.0.3
    • WSO2 Identity Server as Key Manager lt 5.10.0..5.10.0.374
    • WSO2 Open Banking AM lt 2.0.0..2.0.0.403
    • WSO2 Open Banking IAM lt 2.0.0..2.0.0.423
    • WSO2 Carbon Identity Management Endpoint Util lt 5.17.5..5.17.5.332
    • WSO2 Carbon Identity Management Endpoint Util lt 5.18.187..5.18.187.330
    • WSO2 Carbon Identity Management Endpoint Util lt 5.23.8..5.23.8.213
    • WSO2 Carbon Identity Management Endpoint Util lt 5.25.92..5.25.92.167
    • WSO2 Carbon Identity Management Endpoint Util lt 7.0.78..7.0.78.162
    • WSO2 Carbon Identity Application Authentication Framework lt 5.17.5..5.17.5.332
    • WSO2 Carbon Identity Application Authentication Framework lt 5.18.187..5.18.187.330
    Fixed in
    • WSO2 Identity Server 6.1.0.234
    • WSO2 API Manager 3.1.0.354
    • WSO2 API Manager 3.2.0.458
    • WSO2 API Manager 3.2.0.478
    • WSO2 API Manager 3.2.1.96
    • WSO2 API Manager 4.0.0.379
    • WSO2 API Manager 4.1.0.262
    • WSO2 API Manager 4.2.0.200
    • WSO2 API Manager 4.3.0.112
    • WSO2 API Manager 4.4.0.72
    • WSO2 API Manager 4.5.0.55
    • WSO2 API Manager 4.6.0.17
    • WSO2 API Control Plane 4.5.0.56
    • WSO2 API Control Plane 4.6.0.18
    • WSO2 Universal Gateway 4.5.0.55
    • WSO2 Universal Gateway 4.6.0.17
    • WSO2 Traffic Manager 4.5.0.54
    • WSO2 Traffic Manager 4.6.0.17
    • WSO2 Identity Server 5.10.0.383
    • WSO2 Identity Server 5.11.0.430
    • WSO2 Identity Server 6.0.0.257
    • WSO2 Identity Server 6.1.0.257
    • WSO2 Identity Server 7.0.0.133
    • WSO2 Identity Server 7.1.0.41
    • WSO2 Identity Server 7.2.0.3
    • WSO2 Identity Server as Key Manager 5.10.0.374
    • WSO2 Open Banking AM 2.0.0.403
    • WSO2 Open Banking IAM 2.0.0.423
    • WSO2 Carbon Identity Management Endpoint Util 5.17.5.332
    • WSO2 Carbon Identity Management Endpoint Util 5.18.187.330
    • WSO2 Carbon Identity Management Endpoint Util 5.23.8.213
    • WSO2 Carbon Identity Management Endpoint Util 5.25.92.167
    • WSO2 Carbon Identity Management Endpoint Util 7.0.78.162
    • WSO2 Carbon Identity Application Authentication Framework 5.17.5.332
    • WSO2 Carbon Identity Application Authentication Framework 5.18.187.330

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    Metrics

    5.3

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: Vendor (CNA), CVSS v3

    5.3

    CVSS v3

    Severity Medium on the scale from 0 to 10.

    Source: CVE.org

    0.3 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 26.1

    Show all metrics
    Severity
    Medium
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    59.15 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    no public PoC known
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    5.3 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    5.3
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

    Read in glossary
    0.3 %
    Low — model estimates < 1% exploitation likelihood.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    26.1
    Elevated — this CVE ranks above at least 10% of all CVEs scored today.
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published
    CISA assessment (SSVC)
    Exploitation: none known · automatable · Technical impact: partial
    Source: CISA Vulnrichment, as of 15 September 2026
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-203

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    The self-registration flow accepts user-supplied input for usernames without adequately preventing the disclosure of username existence. When a user attempts to register with an existing username, the system responds with an error message that explicitly indicates the username is already in use. This behavior allows an attacker to discover valid usernames within the system. The discovery of valid usernames can facilitate subsequent attacks such as brute force, social engineering, and targeted phishing campaigns.

    Source: NVD (NIST), cvelistv5

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    WSO2WSO2 API Control Plane
    • 4.6.0 – < 4.6.0.18
    • 4.5.0 – < 4.5.0.56
    • 4.6.0.18
    • 4.5.0.56
    WSO2WSO2 API Manager
    • 4.5.0 – < 4.5.0.55
    • 4.4.0 – < 4.4.0.72
    • 3.2.0 – < 3.2.0.458
    • 3.1.0 – < 3.1.0.354
    • 4.2.0 – < 4.2.0.200
    • 4.0.0 – < 4.0.0.379
    • 3.2.1 – < 3.2.1.96
    • 4.3.0 – < 4.3.0.112
    • 4.6.0 – < 4.6.0.17
    • 4.1.0 – < 4.1.0.262
    • 3.2.0 – < 3.2.0.478
    • 4.5.0.55
    • 4.4.0.72
    • 3.2.0.458
    • 3.1.0.354
    • 4.2.0.200
    • 4.0.0.379
    • 3.2.1.96
    • 4.3.0.112
    • 4.6.0.17
    • 4.1.0.262
    • 3.2.0.478
    WSO2WSO2 Carbon Identity Application Authentication Framework
    • 5.18.187 – < 5.18.187.330
    • 5.17.5 – < 5.17.5.332
    • 5.18.187.330
    • 5.17.5.332
    WSO2WSO2 Carbon Identity Management Endpoint Util
    • 5.18.187 – < 5.18.187.330
    • 5.23.8 – < 5.23.8.213
    • 5.25.92 – < 5.25.92.167
    • 5.17.5 – < 5.17.5.332
    • 7.0.78 – < 7.0.78.162
    • 5.18.187.330
    • 5.23.8.213
    • 5.25.92.167
    • 5.17.5.332
    • 7.0.78.162
    WSO2WSO2 Identity Server
    • 7.1.0 – < 7.1.0.41
    • 6.1.0 – < 6.1.0.257
    • 5.11.0 – < 5.11.0.430
    • 6.1.0 – < 6.1.0.234
    • 5.10.0 – < 5.10.0.383
    • 6.0.0 – < 6.0.0.257
    • 7.2.0 – < 7.2.0.3
    • 7.0.0 – < 7.0.0.133
    • 7.1.0.41
    • 6.1.0.257
    • 5.11.0.430
    • 6.1.0.234
    • 5.10.0.383
    • 6.0.0.257
    • 7.2.0.3
    • 7.0.0.133
    WSO2WSO2 Identity Server as Key Manager
    • 5.10.0 – < 5.10.0.374
    • 5.10.0.374
    WSO2WSO2 Open Banking AM
    • 2.0.0 – < 2.0.0.403
    • 2.0.0.403
    WSO2WSO2 Open Banking IAM
    • 2.0.0 – < 2.0.0.423
    • 2.0.0.423
    WSO2WSO2 Traffic Manager
    • 4.6.0 – < 4.6.0.17
    • 4.5.0 – < 4.5.0.54
    • 4.6.0.17
    • 4.5.0.54
    WSO2WSO2 Universal Gateway
    • 4.5.0 – < 4.5.0.55
    • 4.6.0 – < 4.6.0.17
    • 4.5.0.55
    • 4.6.0.17

    Vendors and products

    Weakness classes (CWE)

    • CWE-203Observable Discrepancy

      Base

      The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.

      Entry at MITRE CWE-203

    References & sources

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    1. Record modifiedCISA ADP

      CISA assessment (SSVC): exploitation: none known, automatable: yes

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      SSVC assessmentadded
      —
      {"id":"CVE-2025-5802","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-09-15T12:48:59.851340Z"}

      Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

    2. Receiveded10eef1…

      CVSS V3.1: AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

      Weakness type: CWE-203

      Description added or changed

      Show 5 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Descriptionadded
      —
      The self-registration flow accepts user-supplied input for usernames without adequately preventing the disclosure of username existence. When a user attempts to register with an existing username, the system responds with an error message that explicitly indicates the username is already in use. This behavior allows an attacker to discover valid usernames within the system. The discovery of valid usernames can facilitate subsequent attacks such as brute force, social engineering, and targeted phishing campaigns.
      CVSSadded
      —
      AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
      Weakness type (CWE)added
      —
      CWE-203
      Affected versions (publisher)added
      —
      New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2025/5xxx/CVE-2025-5802.json">CVE-2025-5802</a>
      Referenceadded
      —
      https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4227/

      Source identifier: ed10eef1-636d-4fbe-9993-6890dfa878f8

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