Webmention Vulnerabilities

The Webmention plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to and including 5.8.0 via parser-derived 'avatar' and 'url' author metadata. This is due to insufficient input sanitization and output escaping on user-supplied MF2 author properties processed by the unauthenticated webment...

CVSS:

7.2

Affected:

up to 5.8.0

Fixed in:

5.8.1

Disclosed:

Jun 30, 2026

CVE-2026-10513 on NVD →

Authenticated (Subscriber+) Server-Side Request Forgery vulnerability

CVSS:

6.4

Affected:

up to 5.6.2

Fixed in:

5.7.0

Disclosed:

Apr 2, 2026

Unauthenticated Blind Server-Side Request Forgery vulnerability

CVSS:

5.4

Affected:

up to 5.6.2

Fixed in:

5.7.0

Disclosed:

Apr 2, 2026

The Webmention plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 5.6.2 via the 'Tools::read' function. This makes it possible for authenticated attackers, with Subscriber-level access and above, to make web requests to arbitrary locations originating from the web ap...

CVSS:

6.4

Affected:

up to 5.6.2

Fixed in:

5.7.0

Disclosed:

Apr 1, 2026

CVE-2026-0688 on NVD →

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 we...

CVSS:

7.2

Affected:

up to 5.6.2

Fixed in:

5.7.0

Disclosed:

Apr 1, 2026

CVE-2026-0686 on NVD →

The Webmention plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the ‘replytocom’ parameter in versions up to, and including, 4.0.8 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execut...

CVSS:

6.1

Affected:

up to 4.0.8

Fixed in:

4.0.9

Disclosed:

Mar 8, 2023