Executive Summary

This vulnerability is a Cross-Site Request Forgery (CSRF) issue in the IndieAuth plugin for WordPress versions up to 4.5.4. It occurs because the plugin does not verify a security nonce in the login_form_indieauth() function and the authorization endpoint at wp-login.php?action=indieauth. This allows an attacker to trick an authenticated user into approving OAuth authorization requests for attacker-controlled applications by making the user perform an action like clicking a link or visiting a malicious page while logged in.

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Impact Analysis

An attacker can exploit this vulnerability to force a logged-in user to approve OAuth authorization requests for malicious applications. The attacker can then exchange the stolen authorization code for an access token, effectively taking over the victim's account with permissions to create, update, and delete content or data within the scope granted.

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Mitigation Strategies

To mitigate this vulnerability, immediately update the IndieAuth plugin for WordPress to a version later than 4.5.4 where the nonce verification issue is fixed. Additionally, avoid clicking on suspicious links or visiting untrusted pages while logged in to WordPress to reduce the risk of CSRF attacks.

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