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CVE-2025-5802· NVD / CVE Program· CNA WSO2

Username Enumeration via Self Registration Flow in Multiple WSO2 Products Allows User Account Discovery

Noroxi assessment

Priority: Monitor (action score 21/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.25% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.3 · v3.1—No exploit No fix recorded
Published
Sep 15, 2026
Updated
Sep 18, 2026
EPSS
0.2% · 15th percentile

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · WSO2
5.3
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2025-5802

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

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Versions reported by the vendor

Affected version ranges reported by the assigning authority (WSO2). Independent of NVD's CPE analysis and usually ahead of it.

  • WSO2 WSO2 API Control Plane

    • before 4.5.0unknown
    • 4.5.0 and later · before 4.5.0.56affected
    • 4.6.0 and later · before 4.6.0.18affected

  • WSO2 WSO2 API Manager

    • before 3.1.0unknown
    • 3.1.0 and later · before 3.1.0.354affected
    • 3.2.0 and later · before 3.2.0.458affected
    • 3.2.0 and later · before 3.2.0.478affected
    • 3.2.1 and later · before 3.2.1.96affected
    • 4.0.0 and later · before 4.0.0.379affected
    • 4.1.0 and later · before 4.1.0.262affected
    • 4.2.0 and later · before 4.2.0.200affected
    • 4.3.0 and later · before 4.3.0.112affected
    • 4.4.0 and later · before 4.4.0.72affected

  • WSO2 WSO2 Carbon Identity Application Authentication Framework

    • 5.17.5 and later · before 5.17.5.332affected
    • 5.18.187 and later · before 5.18.187.330affected
    • x and laternot affected

  • WSO2 WSO2 Carbon Identity Management Endpoint Util

    • 5.17.5 and later · before 5.17.5.332affected
    • 5.18.187 and later · before 5.18.187.330affected
    • 5.23.8 and later · before 5.23.8.213affected
    • 5.25.92 and later · before 5.25.92.167affected
    • 7.0.78 and later · before 7.0.78.162affected
    • x and laternot affected

  • WSO2 WSO2 Identity Server

    • before 5.10.0unknown
    • 5.10.0 and later · before 5.10.0.383affected
    • 5.11.0 and later · before 5.11.0.430affected
    • 6.0.0 and later · before 6.0.0.257affected
    • 6.1.0 and later · before 6.1.0.234affected
    • 6.1.0 and later · before 6.1.0.257affected
    • 7.0.0 and later · before 7.0.0.133affected
    • 7.1.0 and later · before 7.1.0.41affected
    • 7.2.0 and later · before 7.2.0.3affected

  • WSO2 WSO2 Identity Server as Key Manager

    • before 5.10.0unknown
    • 5.10.0 and later · before 5.10.0.374affected

  • WSO2 WSO2 Open Banking AM

    • before 2.0.0unknown
    • 2.0.0 and later · before 2.0.0.403affected

  • WSO2 WSO2 Open Banking IAM

    • before 2.0.0unknown
    • 2.0.0 and later · before 2.0.0.423affected

  • WSO2 WSO2 Traffic Manager

    • before 4.5.0unknown
    • 4.5.0 and later · before 4.5.0.54affected
    • 4.6.0 and later · before 4.6.0.17affected

  • WSO2 WSO2 Universal Gateway

    • before 4.5.0unknown
    • 4.5.0 and later · before 4.5.0.55affected
    • 4.6.0 and later · before 4.6.0.17affected

Same product

wso2: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-14561Access Control Bypass via Publisher REST APIs in Multiple WSO2 Products Allows Cross-Tenant Operations
    36Monitor
  • CVE-2026-3418Arbitrary File Upload via System REST API in Multiple WSO2 Products Allows Remote Code Execution
    36Monitor
  • CVE-2026-3415XML External Entity (XXE) Injection via Schema Validation in Multiple WSO2 Products Allows File Reading and Denial of Service
    34Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2025-6508Aug 6, 2026 · User Interface Misrepresentation via Swagger UI Try-out Console in WSO2 API Manager Allows Sensitive Information Exposure or Unintended Requests
    17Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-203 · Observable Discrepancy

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records