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

CVE-2026-3415

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.

No Active Exploit Signals
CVSS Base Score
8.7
HIGH
Exploitability:2.3
Impact Score:5.8
EPSS Probability:0.34%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
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Weaponization
—
SSVC Action
—

Weaknesses (CWE)

CWE-776 ↗CWE-776: Improper Handling of Special Elements in XML Document Type Declaration (DTD)

Affected Products & Versions

Vendor Product Affected Versions
WSO2 WSO2 API Manager 0 < 3.2.0 (unknown), 3.2.0 < 3.2.0.472 (affected), 3.2.1 < 3.2.1.91 (affected), 4.1.0 < 4.1.0.254 (affected), 4.2.0 < 4.2.0.194 (affected), 4.3.0 < 4.3.0.105 (affected), 4.4.0 < 4.4.0.68 (affected), 4.5.0 < 4.5.0.53 (affected), 4.6.0 < 4.6.0.16 (affected)
WSO2 WSO2 Universal Gateway 4.5.0 < 4.5.0.53 (affected), 4.6.0 < 4.6.0.16 (affected)
WSO2 WSO2 Traffic Manager 4.5.0 < 4.5.0.52 (affected), 4.6.0 < 4.6.0.16 (affected)
WSO2 WSO2 API Control Plane 4.5.0 < 4.5.0.54 (affected), 4.6.0 < 4.6.0.17 (affected)
WSO2 WSO2 Carbon API Gateway 6.7.206 < 6.7.206.594 (affected), 6.7.210 < 6.7.210.95 (affected), 9.20.74 < 9.20.74.398 (affected), 9.28.116 < 9.28.116.412 (affected), 9.29.120 < 9.29.120.228 (affected), 9.30.67 < 9.30.67.158 (affected), 9.31.86 < 9.31.86.147 (affected), 9.32.147 < 9.32.147.38 (affected), 9.33.61 <= * (unaffected)
WSO2 WSO2 Carbon API Management Implementation 6.7.206 < 6.7.206.594 (affected), 6.7.210 < 6.7.210.95 (affected), 9.20.74 < 9.20.74.398 (affected), 9.28.116 < 9.28.116.412 (affected), 9.29.120 < 9.29.120.228 (affected), 9.30.67 < 9.30.67.158 (affected), 9.31.86 < 9.31.86.147 (affected), 9.32.147 < 9.32.147.38 (affected), 9.33.61 <= * (unaffected)

References & Technical Advisories

No reference links found.

Threat Intelligence Signals

EPSS Score
0.342%

Identity & Timeline

StatusPUBLISHED
Assigning AuthorityWSO2 LLC · Vendor · USA
Reserved2026-03-01T18:48:45
Published2026-08-06T17:32:10
Last Updated2026-09-23T16:04:57

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