CVE-2026-0686CWE-918

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

High · published April 2, 2026

CVSS v3.1
7.2
EPSS
0%
Percentile
21.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.2 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00302 · 21.6th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-04-02T07:39Z
EPSS history
Timeline
  • 02 APR 07:39Z
    Webmention <= 5.6.2 - Unauthenticated Blind Server-Side Request Forgery
    cvelistv5