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Fencer Intel
medium 5.8

CVE-2024-7478 json

Username Enumeration via External User Stores in Multiple WSO2 Products Allows User Account Discovery

published 21d ago modified 12d ago also EUVD-2024-55813

cvss
5.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits
0
none known

Summary

When a WSO2 product is configured to use an external user store, the system fails to adequately obscure the existence or validity of usernames during authentication attempts. This oversight allows an attacker to repeatedly query the authentication mechanism with different username guesses, enabling the enumeration of valid usernames present in the external user store.

The discovery of valid usernames can increase the risk of targeted brute-force attacks, social engineering, and information leakage. Attackers can leverage this information to craft more convincing phishing campaigns or other social engineering tactics to trick users into revealing sensitive data. The presence of username enumeration could also negatively impact an organization's reputation, leading to loss of customer trust, regulatory non-compliance, and potential legal and financial repercussions.

Patch / fix

  • WSO2 WSO2 API Manager 3.1.0.310, 3.2.0.401, 3.2.1.26, 4.0.0.318, 4.1.0.180, 4.2.0.119, 4.3.0.30
  • WSO2 WSO2 Identity Server as Key Manager 5.10.0.320
  • WSO2 WSO2 Identity Server 5.10.0.326, 6.0.0.214, 6.1.0.198, 7.0.0.67
  • WSO2 WSO2 Open Banking IAM 2.0.0.371
  • WSO2 WSO2 Open Banking AM 2.0.0.351
  • WSO2 WSO2 Carborn Identity Handler 1.4.0.15, 1.4.0.16, 1.4.11.14, 1.4.37.1, 1.6.1.5, 1.7.1.1, 1.8.6.5, 1.8.14.1, 1.9.2.4

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CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
12d ago

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 5.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

Affected products

  • WSO2 WSO2 API Manager
  • WSO2 WSO2 Identity Server as Key Manager
  • WSO2 WSO2 Identity Server
  • WSO2 WSO2 Open Banking IAM
  • WSO2 WSO2 Open Banking AM
  • WSO2 WSO2 Carborn Identity Handler

Classification

Weakness
  • CWE-204 Observable Response Discrepancy

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.