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Fencer Vulns
high 8.7

CVE-2026-3415 json

XML External Entity (XXE) Injection via Schema Validation in Multiple WSO2 Products Allows File Reading and Denial of Service

published 2026-08-06 3 mo ago modified 2026-10-28 12 d ago also EUVD-2026-54208

cvss
8.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
0
none known

Summary

The XML and schema validation functionalities within the SchemaValidator Mediator process XML input as part of validation flows. Under certain conditions, the XML parser allows the resolution of external entities when handling user-supplied XML content during validation operations. This behavior can occur when an attacker supplies crafted XML payloads to the relevant mediator flows with sufficient privileges.

Successful exploitation may allow a highly privileged actor to read files accessible within the server hosting the affected product. Additionally, it may be possible to trigger outbound requests to unintended internal or external locations, depending on the server environment and network configuration. Specially crafted XML payloads can also lead to excessive resource consumption during parsing, impacting the availability of the product.

Patch / fix

  • WSO2 WSO2 API Manager 3.2.0.472, 3.2.1.91, 4.1.0.254, 4.2.0.194, 4.3.0.105, 4.4.0.68, 4.5.0.53, 4.6.0.16
  • WSO2 WSO2 Universal Gateway 4.5.0.53, 4.6.0.16
  • WSO2 WSO2 Traffic Manager 4.5.0.52, 4.6.0.16
  • WSO2 WSO2 API Control Plane 4.5.0.54, 4.6.0.17
  • WSO2 WSO2 Carbon API Gateway 6.7.206.594, 6.7.210.95, 9.20.74.398, 9.28.116.412, 9.29.120.228, 9.30.67.158, 9.31.86.147, 9.32.147.38, 9.33.61
  • WSO2 WSO2 Carbon API Management Implementation 6.7.206.594, 6.7.210.95, 9.20.74.398, 9.28.116.412, 9.29.120.228, 9.30.67.158, 9.31.86.147, 9.32.147.38, 9.33.61

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.7 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:H

Affected products

  • WSO2 WSO2 API Manager
  • WSO2 WSO2 Universal Gateway
  • WSO2 WSO2 Traffic Manager
  • WSO2 WSO2 API Control Plane
  • WSO2 WSO2 Carbon API Gateway
  • WSO2 WSO2 Carbon API Management Implementation

Classification

Weakness
  • CWE-776 Improper Restriction of Recursive Entity References in DTDs

References

Sources

Fencer Vulns 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.