CVE-2026-4249 api control plane vulnerability
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.
Quick answer
wso2 api control plane should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- Review vendor advisory for affected versions.
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
WSO2 API Control Plane / API Manager is affected by CVE-2026-4249, a denial-of-service risk. The throttling event handling mechanism in multiple WSO2 products accepts user-supplied JSON payloads without sufficient validation of their structure and content. The recommended remediation is to update to the WSO2 fixed update level for the deployed API Manager, API Control Plane, Traffic Manager, or Universal Gateway branch listed in WSO2-2026-5236. Until the update is complete, restrict throttling event endpoints and validate JSON event payloads before they reach gateway components, review logs, and reduce exposure of the affected package, route, provider, or service workflow.
- Inventory every deployment, package, dependency, build runner, integration, route, service, and managed environment that uses WSO2 API Control Plane / API Manager.
- Confirm the installed version/build and compare it with the affected versions listed in the source advisory and the source advisory for CVE-2026-4249.
- Apply the vendor-supported fix: update to the WSO2 fixed update level for the deployed API Manager, API Control Plane, Traffic Manager, or Universal Gateway branch listed in WSO2-2026-5236.
- If the update cannot be applied immediately, restrict throttling event endpoints and validate JSON event payloads before they reach gateway components; disable unnecessary public access, package-install paths, file processing, webhooks, message consumers, or high-risk integrations until patched.
- Review application, CI/CD, package manager, container, reverse-proxy, WAF, authentication, route, and audit logs for activity related to CVE-2026-4249.
- Rotate sessions, API tokens, package registry credentials, cloud credentials, webhook secrets, service credentials, and administrator passwords if logs or affected data indicate compromise, credential exposure, or unauthorized access.
- Clear caches, restart affected services, rebuild affected containers or build agents when appropriate, and remove temporary files, malicious artifacts, stored payloads, or unsafe configuration created during exploitation attempts.
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Verify the fix
- Confirm WSO2 API Control Plane / API Manager now reports the WSO2 fixed update level for the deployed API Manager, API Control Plane, Traffic Manager, or Universal Gateway branch listed in WSO2-2026-5236 or a later vendor-supported fixed release/build for the deployed branch.
- Verify the affected workflow no longer allows the behavior described in CVE-2026-4249, using a safe regression test, dependency inventory, or vendor validation method.
- Review logs after remediation for continued exploit attempts, denial-of-service symptoms, suspicious redirects, unauthorized requests, path traversal, header manipulation, credential exposure, or configuration changes.
- Rerun a Fixnx scan and any product-specific scanner, package audit, dependency check, route regression test, or integration test relevant to the affected service.
- Document affected assets, fixed versions, mitigation decisions, validation evidence, and any cleanup, rebuild, or credential rotation performed.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-4249?
wso2 api control plane should be checked against the vendor advisory and trusted references linked on this page.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.