CVE-2026-3415

Received Received - Intake

XML External Entity Processing in WSO2 API Manager

Publication date: 2026-08-06

Last updated on: 2026-08-06

Assigner: WSO2 LLC

Description

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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-06

Last Modified

2026-08-06

Generated

2026-08-07

AI Q&A

2026-08-07

EPSS Evaluated

N/A

NVD

CVE-2026-3415

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-776	The product uses XML documents and allows their structure to be defined with a Document Type Definition (DTD), but it does not properly control the number of recursive definitions of entities.

Attack-Flow Graph

Executive Summary

This vulnerability involves the SchemaValidator Mediator improperly processing XML input during validation flows. When handling user-supplied XML content, the XML parser may resolve external entities, allowing attackers with sufficient privileges to craft malicious XML payloads. This can lead to unauthorized file reads on the server or trigger unintended outbound requests depending on the environment.

Detection Guidance

Detecting this vulnerability requires monitoring XML parsing behavior and external entity resolution attempts. Check server logs for unusual XML parsing errors or excessive resource consumption during validation flows. Inspect network traffic for unexpected outbound requests triggered by crafted XML payloads. Enable verbose logging in the SchemaValidator Mediator to capture XML processing details.

Impact Analysis

An attacker could exploit this to read sensitive files on the server hosting the affected product. They might also make unexpected network requests to internal or external systems, depending on the server's configuration. Additionally, crafted XML payloads could consume excessive server resources, causing service disruptions or crashes.

Compliance Impact

This vulnerability could lead to unauthorized data access, violating GDPR's data protection principles or HIPAA's security requirements for protected health information. Organizations may face compliance breaches, legal penalties, or reputational damage if exploited.

Mitigation Strategies

Disable external entity resolution in XML parsers used by the SchemaValidator Mediator. Update or patch the affected product to a version that addresses this issue. Restrict privileges for users who can submit XML payloads to the mediator flows.

Hi! I’m here to help you understand CVE-2026-3415. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70