Vulnerability · Published Jul 6, 2026 · Assigned by WSO2
CVE-2026-4249Denial of Service via Malicious JSON Payloads in Throttling Events in Multiple WSO2 Products Causing Persistent Service Disruption
High 8.6
In plain English
A high-severity security flaw in WSO2 API Control Plane from WSO2. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| WSO2 | WSO2 Universal Gateway | 4.5.0 – before 4.5.0.544.6.0 – before 4.6.0.184.7.0 – before 4.7.0.2 |
| WSO2 | WSO2 Traffic Manager | 4.5.0 – before 4.5.0.534.6.0 – before 4.6.0.184.7.0 – before 4.7.0.2 |
| WSO2 | WSO2 API Control Plane | 4.5.0 – before 4.5.0.554.6.0 – before 4.6.0.194.7.0 – before 4.7.0.2 |
| WSO2 | WSO2 API Manager | 3.2.0 – before 3.2.0.4703.2.1 – before 3.2.1.894.0.0 – before 4.0.0.3904.1.0 – before 4.1.0.2544.2.0 – before 4.2.0.1944.3.0 – before 4.3.0.1054.4.0 – before 4.4.0.69 |
Weakness: CWE-707 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H