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Published: 8th February 2021

Version: 1.0.0

Severity: Medium

CVSS Score: 4.7 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N)  


WSO2 API Manager : 2.6.0 , 3.0.0 , 3.1.0 , 3.2.0
WSO2 API Manager Analytics : 2.6.0 
WSO2 IoT Server : 3.3.1


HTTP request headers get reflected in the response to the client.


When an HTTP based API request returns an error or when an HTTP OPTIONS call is made, request headers are returning back to the client as response headers, without any filtration from the server.


By leveraging this vulnerability, a malicious actor could set response header values in a way that might harm an unsuspecting user.


If you are using an affected product version, it is highly recommended to migrate to the latest released version to receive security fixes.

You may also apply the relevant fixes based on the changes from the public fix: https://github.com/wso2/carbon-apimgt/pull/9524https://github.com/wso2/product-apim/pull/9650

Note: If you are a WSO2 customer with Support Subscription, please use WSO2 Update Manager (WUM) updates in order to apply the fix.

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