CVE-2026-4249 remediation guide

WSO2 WSO2 Universal Gateway, WSO2 Traffic Manager, WSO2 API Control Plane

The throttling event handling mechanism in multiple WSO2 products accepts user-supplied JSON payloads without sufficient validation of their structure and content. This allows an unauthenticated remote attacker to inject malicious JSON data that can lead to a persistent denial of service condition. Successful exploitation of this vulnerability can disrupt the API Gateway, preventing legitimate API traffic from being processed and impacting complete service availability. The denial of service is persistent, requiring manual intervention to restore normal operations.

Open CVE record

ProductWSO2 WSO2 Universal Gateway, WSO2 Traffic Manager, WSO2 API Control Plane

Affected versions4.5.0, 4.6.0, 4.7.0, 3.2.0, 3.2.1, 4.0.0, 4.1.0, 4.2.0, 4.3.0, 4.4.0, >= 4.5.0 < 4.5.0.55, >= 4.6.0 < 4.6.0.19, >= 4.0.0 < 4.0.0.390, >= 4.1.0 < 4.1.0.254, >= 4.2.0 < 4.2.0.194, >= 4.3.0 < 4.3.0.105, >= 4.4.0 < 4.4.0.69, >= 4.5.0 < 4.5.0.54, >= 4.6.0 < 4.6.0.18, >= 4.5.0 < 4.5.0.53

Fixed versions4.5.0.55, 4.6.0.19, 4.0.0.390, 4.1.0.254, 4.2.0.194, 4.3.0.105, 4.4.0.69, 4.5.0.54, 4.6.0.18, 4.5.0.53

Priority basisReview · CVSS 8.6 · EPSS 0.34%

Identify the affected asset

Confirm whether WSO2 WSO2 Universal Gateway, WSO2 Traffic Manager, WSO2 API Control Plane is installed, record the deployed version and installation path, and identify exposed interfaces.

Record the product name, package or appliance identifier, and installed version.
Identify internet-facing, administrative, API, and internal access paths.
Preserve the pre-change configuration and relevant service logs.

Validate the affected-version match

Compare the deployed version with the affected range: 4.5.0, 4.6.0, 4.7.0, 3.2.0, 3.2.1, 4.0.0, 4.1.0, 4.2.0, 4.3.0, 4.4.0, >= 4.5.0 < 4.5.0.55, >= 4.6.0 < 4.6.0.19, >= 4.0.0 < 4.0.0.390, >= 4.1.0 < 4.1.0.254, >= 4.2.0 < 4.2.0.194, >= 4.3.0 < 4.3.0.105, >= 4.4.0 < 4.4.0.69, >= 4.5.0 < 4.5.0.54, >= 4.6.0 < 4.6.0.18, >= 4.5.0 < 4.5.0.53. Treat incomplete inventory results as unresolved.

Prioritize with independent signals

The CVSS severity warrants an early asset and exposure review. Combine this signal with asset criticality, exposure, compensating controls, and business impact.

Apply supported remediation

Follow the vendor advisory or supported update path. Current fixed-version status: 4.5.0.55, 4.6.0.19, 4.0.0.390, 4.1.0.254, 4.2.0.194, 4.3.0.105, 4.4.0.69, 4.5.0.54, 4.6.0.18, 4.5.0.53. Preserve configuration and rollback material before change.

Verify the result

Confirm the resulting version, service health, authentication and access paths, monitoring coverage, and relevant security logs.

Confirm the expected version and package state.
Run a functional health check for critical service paths.
Review authentication, error, application, and security monitoring logs.
Reassess exposure if the supported fix cannot be applied.

Operational boundary

This page does not replace the vendor advisory, support contract, change-management process, or recovery plan. Do not infer that an asset is unaffected from an incomplete inventory query or a missing fixed-version field.