Medium · published May 11, 2026
In Webhook API invocations, the component accepts user-supplied input for HTTP request headers without sufficient validation or sanitization, allowing these headers to be injected into HTTP responses.
By exploiting this vulnerability, a malicious actor can inject or overwrite arbitrary HTTP response headers. This can lead to various adverse effects, including the manipulation of browser caching, alteration of security-related headers, and the injection of sensitive information such as cookie values, potentially enabling session hijacking or other malicious activities.
| Product | Versions | Fixed in |
|---|---|---|
| wso2/api_control_plane | ≥ 4.5.0, < 4.5.0.21 | 4.5.0.21 |
| wso2/api_manager | ≥ 4.1.0, < 4.1.0.218 | 4.1.0.218 |
| wso2/api_manager | ≥ 4.2.0, < 4.2.0.164 | 4.2.0.164 |
| wso2/api_manager | ≥ 4.3.0, < 4.3.0.74 | 4.3.0.74 |
| wso2/api_manager | ≥ 4.4.0, < 4.4.0.38 | 4.4.0.38 |
| wso2/api_manager | ≥ 4.5.0, < 4.5.0.20 | 4.5.0.20 |
| wso2/traffic_manager | ≥ 4.5.0, < 4.5.0.19 | 4.5.0.19 |
| wso2/universal_gateway | ≥ 4.5.0, < 4.5.0.19 | 4.5.0.19 |