What the vulnerability does
01Description
Fediverse Embeds embeds fediverse posts on WordPress sites. Prior to version 1.5.8, Fediverse Embeds registered an unauthenticated REST route ftf/media-proxy (includes/Media_Proxy.php) with permission_callback => __return_true that accepted a base64-encoded URL and forwarded it to wp_remote_get($url) without enforcing any allowlist. The plugin's source contained a comment block explicitly acknowledging that the request should be validated against allowed fediverse domains, but in 1.5.7 the validation only set a local $can_download_media flag that was never read. The full response body was echoed back to the caller, so this was a full-read SSRF / open proxy reachable by any anonymous visitor. This issue has been patched in version 1.5.8.
Explanation of Vulnerability in Simple Terms
02Summary
The Fediverse Embeds WordPress plugin before version 1.5.8 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. No authentication is required. This could expose internal services, leak sensitive data, or be used to attack other systems.
What an attacker can do
03Attacker Capabilities
Make the site send HTTP requests to internal or external systems without authorization.
Potential impact on your site
04Site Impact
Attackers can probe your internal network, access internal services, or use your site to attack other systems.
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
