Security Advisory WSO2-2021-1530¶
Published: April 01, 2022
CVSS Score: 6.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)
- WSO2 API Manager : 2.2.0 , 2.5.0 , 2.6.0 , 3.0.0 , 3.1.0 , 3.2.0 , 4.0.0
- WSO2 IS as Key Manager : 5.5.0 , 5.6.0 , 5.7.0 , 5.9.0 , 5.10.0
- WSO2 Identity Server : 5.5.0 , 5.6.0 , 5.7.0 , 5.8.0 , 5.9.0 , 5.10.0 , 5.11.0
Reflected Cross-Site Scripting (XSS) vulnerability in the OAuth2 Authorization flow.
Due to improper output encoding, a Reflected Cross Site Scripting (XSS) attack can be carried out by tampering the parameter in the OAuth2 Authorization flow when "form_post" response mode is enabled.
By leveraging the XSS attack, a malicious actor can make the browser get redirected to a malicious website, make changes in the UI of the web page, retrieve information from the browser or harm otherwise. However, since all the session related sensitive cookies are set with httpOnly flag and protected, session hijacking or similar attacks would not be possible.
If the latest version of the affected WSO2 product is not mentioned under the affected product list, you may migrate to the latest version to receive security fixes.
Otherwise, you may apply the relevant fixes to the product based on the public fix(s):
If you are a WSO2 customer with a support subscription, use WSO2 Updates in order to apply the fix.
WSO2 thanks, Anders Norlander for responsibly reporting the identified issue and working with us as we addressed it.