Can you explain this vulnerability to me?

The Infomaniak Connect for OpenID plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in the 'endpoint_login' parameter of the infomaniak_connect_generic_auth_url shortcode in all versions up to and including 1.0.2.

This vulnerability arises because the plugin does not properly sanitize input or escape output for this parameter, allowing authenticated users with Contributor-level access or higher to inject arbitrary web scripts.

These injected scripts are stored and executed whenever any user accesses the affected page, potentially compromising user sessions or performing malicious actions.

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How can this vulnerability impact me? :

This vulnerability allows authenticated attackers with Contributor-level access or above to inject malicious scripts into pages.

When other users visit these pages, the injected scripts execute in their browsers, which can lead to theft of session cookies, unauthorized actions performed on behalf of users, or other malicious activities.

Because the vulnerability is a Stored Cross-Site Scripting issue, the impact includes potential compromise of user accounts, defacement, or further exploitation of the WordPress site.

The CVSS score of 6.4 (Medium severity) reflects the risk of confidentiality and integrity loss without availability impact.

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How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:

I don't know

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How can this vulnerability be detected on my network or system? Can you suggest some commands?

This vulnerability involves Stored Cross-Site Scripting (XSS) via the 'endpoint_login' parameter of the infomaniak_connect_generic_auth_url shortcode in the Infomaniak Connect for OpenID WordPress plugin up to version 1.0.2. Detection involves identifying if this plugin and vulnerable versions are installed and if the 'endpoint_login' parameter can be manipulated.

To detect exploitation attempts or presence of malicious scripts injected via this vulnerability, you can search your WordPress database or page content for suspicious scripts or payloads in pages using the shortcode.

• Search WordPress posts or pages for the shortcode usage and suspicious script tags or payloads, e.g., using WP-CLI: wp post list --post_type=page,post --field=ID | xargs -I % wp post get % --field=post_content | grep -i 'infomaniak_connect_generic_auth_url'
• Check for suspicious script injections in the 'endpoint_login' parameter by searching the database directly, for example using SQL: SELECT ID, post_content FROM wp_posts WHERE post_content LIKE '%endpoint_login%<script>%';
• Monitor HTTP requests to your WordPress site for unusual POST or GET requests containing script payloads targeting the 'endpoint_login' parameter.

Since the vulnerability requires authenticated users with Contributor-level access or higher to inject scripts, auditing user activity logs for suspicious shortcode usage or content changes may also help detect exploitation.

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What immediate steps should I take to mitigate this vulnerability?

The primary mitigation step is to update the Infomaniak Connect for OpenID WordPress plugin to a version later than 1.0.2 where this vulnerability is fixed.

If an immediate update is not possible, restrict Contributor-level and higher user permissions to trusted users only, as the vulnerability requires authenticated users with such access to exploit.

Review and sanitize any user-generated content that uses the 'endpoint_login' parameter or the infomaniak_connect_generic_auth_url shortcode to remove any injected scripts.

Consider disabling or removing the vulnerable plugin temporarily until a patch or update is applied.

Implement Web Application Firewall (WAF) rules to detect and block attempts to inject scripts via the 'endpoint_login' parameter.

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