CVE-2026-0686

HIGH

Webmention <= 5.6.2 - Unauthenticated Blind Server-Side Request Forgery

Title source: cna

Description

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.

References (5)

https://www.wordfence.com/threat-intel/vulnerabilities/id/08d15c46-d15f-4803-80be-90bf33335c18?source=cve

https://github.com/pfefferle/wordpress-webmention/blob/057223cee18a9e93b017d0f21db6ea77a7686489/includes/handler/class-mf2.php#L878

View Writeup ZIP pw:eip

https://plugins.trac.wordpress.org/browser/webmention/tags/5.6.2/includes/handler/class-mf2.php#L877

https://plugins.trac.wordpress.org/browser/webmention/tags/5.6.2/includes/class-receiver.php#L260

https://plugins.trac.wordpress.org/changeset/3494831/webmention

Scores

CVSS v3 7.2

EPSS 0.0005

EPSS Percentile 16.8%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-918

Status published

Products (1)

pfefferle/Webmention < 5.6.2

Published Apr 02, 2026

Tracked Since Apr 02, 2026