What the vulnerability does
01Description
Fediverse Embeds embeds fediverse posts on WordPress sites. Prior to version 1.5.9, Fediverse Embeds registered the unauthenticated AJAX action wp_ajax_nopriv_ftf_get_site_info (includes/Site_Info.php) that verified a nonce ftf-fediverse-embeds-nonce and then called file_get_html($site_url) on the attacker-supplied URL. The same nonce was enqueued onto every public page containing a fediverse embed (via includes/Enqueue_Assets.php lines 41-46 + includes/Helpers.php lines 64-83), so the nonce gate was not an authentication boundary; any visitor of a public post with an embed could grab it and reuse it. This issue has been patched in version 1.5.9.
Explanation of Vulnerability in Simple Terms
02Summary
The Fediverse Embeds WordPress plugin before version 1.5.9 contains a server-side request forgery vulnerability. An attacker can make the plugin send HTTP requests to internal or external systems on behalf of the site. This could expose sensitive data or allow interaction with services that should not be accessible from the web.
What an attacker can do
03Attacker Capabilities
Make the site send HTTP requests to internal systems or external URLs without authorization.
Potential impact on your site
04Site Impact
Attackers can probe your internal network, access private services, or exfiltrate data via the plugin.
Conditions required to exploit
05Prerequisites
Network access to the site; no authentication or user interaction required.
Key dates
06Disclosure timeline
June 11, 2026
CVE published
June 11, 2026
Record updated
