PT-2026-29686 · Pfefferle · Webmention

Published 2026-04-02 · Updated 2026-04-02 · CVE-2026-0686

NVD

CVSS v3.1

7.2

High

AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

The Webmention plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 5.6.2 in the 'MF2::parse authorpage' function via the 'Receiver::post' function. This makes it possible for unauthenticated attackers to make web requests to arbitrary locations originating from the web application and can be used to query and modify information from internal services.

Fix

SSRF

Weakness Enumeration

CWE-918

Related Identifiers

CVE-2026-0686

Affected Products

Webmention

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-0686 · Security Note
• https://github.com/pfefferle/wordpress-webmention/blob/057223cee18a9e93b017d0f21db6ea77a7686489/includes/handler/class-mf2.php#L878 · Note
• https://plugins.trac.wordpress.org/changeset/3494831/webmention · Note
• https://plugins.trac.wordpress.org/browser/webmention/tags/5.6.2/includes/handler/class-mf2.php#L877 · Note
• https://wordfence.com/threat-intel/vulnerabilities/id/08d15c46-d15f-4803-80be-90bf33335c18?source=cve · Note
• https://plugins.trac.wordpress.org/browser/webmention/tags/5.6.2/includes/class-receiver.php#L260 · Note