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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 webmention REST endpoint and rendered directly into HTML 'value' attributes by the edit-comment-form template without esc_attr() or esc_url(). This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a privileged user (moderator or administrator) opens the affected comment edit screen.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Webmention Plugin | — | Update webmention plugin to version 5.8.1, or a newer patched version | Jul 1, 2026 | Jun 30, 2026 |
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