Webmention <= 5.8.0 - Unauthenticated Stored Cross-Site Scripting via MF2 'photo'/'url' Author Properties
| CVE | CVE-2026-10513 |
|---|---|
| CVSS | 7.2 (High) |
| Publicly Published | June 30, 2026 |
| Last Updated | June 30, 2026 |
| Researcher |
Volodymyr Kolesnykov
|
Description
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.
Learn more about Cross-Site Scripting vulnerabilities and how to prevent them.
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Vulnerability Details for Webmention
| Software Type | Plugin |
|---|---|
| Software Slug | webmention (view on wordpress.org) |
| Patched? | Yes |
| Remediation | Update to version 5.8.1, or a newer patched version |
| Affected Version |
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| Patched Version |
|
Recent vulnerabilities in Webmention
| # | Title | CVE ID | CVSS | Researchers | Date |
|---|---|---|---|---|---|
| 1 | Webmention <= 5.6.2 - Authenticated (Subscriber+) Server-Side Request Forgery | CVE-2026-0688 | Duong Quang Hao | April 1, 2026 | |
| 2 | Webmention <= 5.6.2 - Unauthenticated Blind Server-Side Request Forgery | CVE-2026-0686 | Duong Quang Hao | April 1, 2026 | |
| 3 | Webmention <= 4.0.8 - Reflected Cross-Site Scripting via 'replytocom' | March 8, 2023 |
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