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Fencer Intel
medium 4.3

CVE-2024-12139 json

Content Spoofing via Error Handling in Multiple WSO2 Products Enables Social Engineering Attacks

published 12d ago modified 6d ago also EUVD-2024-55841

cvss
4.3
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 11%
public exploits
0
none known

Summary

The error handling implementation fails to properly sanitize or validate user-supplied input within URL parameters under specific conditions. This allows end-users to manipulate the error messages that are displayed by the application.

By exploiting this vulnerability, malicious actors can inject arbitrary content into error messages. This enables them to perform social engineering attacks, such as phishing or credential theft, by replacing legitimate error messages with malicious content, misleading users into compromising sensitive information or taking harmful actions.

Patch / fix

  • WSO2 WSO2 API Manager 3.2.1.49, 4.1.0.210, 4.2.0.148
  • WSO2 WSO2 Identity Server 5.10.0.346, 5.11.0.385, 6.0.0.229
  • WSO2 WSO2 Identity Server as Key Manager 5.10.0.339

Is CVE-2024-12139 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
12d ago

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 11% of all scored CVEs (FIRST EPSS, 2026-11-14).

CVSS scores

assigned by version score vector
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Affected products

  • WSO2 WSO2 API Manager
  • WSO2 WSO2 Identity Server
  • WSO2 WSO2 Identity Server as Key Manager

Classification

Weakness
  • CWE-116 Improper Encoding or Escaping of Output

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.