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Cross-site Scripting occurrences in Saml Sp Single Sign On

Utilities.php in the miniorange-saml-20-single-sign-on plugin before 4.8.84 for WordPress allows XSS via a crafted SAML XML Response to wp-login.php. This is related to the SAMLResponse and RelayState variables, and the Destination parameter of the samlp:Response XML element. (2020-02-17, CVE-2020-6850)

In the miniOrange SAML SP Single Sign On plugin before 4.8.73 for WordPress, the SAML Login Endpoint is vulnerable to XSS via a specially crafted SAMLResponse XML post. (2019-06-24, CVE-2019-12346)

Why Cross-site Scripting can be dangerous

Cross site scripting is an attack where a web page executes code that is injected by an adversary. It usually appears, when users input is presented. This attack can be used to impersonate a user, take over control of the session, or even steal API keys.

The attack can be executed e.g. when you application injects the request parameter directly into the HTML code of the page returned to the user:

https://server.com/confirmation?message=Transaction+Complete

what results in:

<span>Confirmation: Transaction Complete</span>

In that case the message can be modified to become a valid Javascript code, e.g.:

https://server.com/confirmation?message=<script>dangerous javascript code here</script>

and it will be executed locally by the user's browser with full access to the user's personal application/browser data:

<span>Confirmation: <script>dangerous javascript code here</script></span>

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