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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.

PUBLISHED Reserved 2026-01-07 | Published 2026-04-02 | Updated 2026-04-08 | Assigner Wordfence




HIGH: 7.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Problem types

CWE-918 Server-Side Request Forgery (SSRF)

Product status

Default status
unaffected

Any version
affected

Timeline

2026-01-07:Vendor Notified
2026-04-01:Disclosed

Credits

Duong Quang Hao finder

References

www.wordfence.com/...-d15f-4803-80be-90bf33335c18?source=cve

github.com/...db6ea77a7686489/includes/handler/class-mf2.php

plugins.trac.wordpress.org/...includes/handler/class-mf2.php

plugins.trac.wordpress.org/....2/includes/class-receiver.php

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

cve.org (CVE-2026-0686)

nvd.nist.gov (CVE-2026-0686)

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