CVE-2026-12516: Unknown Fediverse Embeds

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

The Fediverse Embeds WordPress plugin before 1.5.8 does not validate the destination of the server-side request performed by an unauthenticated media-proxying endpoint, allowing anonymous users to make the site fetch arbitrary URLs, including internal and private-network addresses, and read back the response body. This results in a full-read Server-Side Request Forgery and open proxy.

Affected products

• Unknown Fediverse Embeds: before 1.5.8 (fixed in 1.5.8)

Published 2026-07-09. Last modified 2026-07-09.