CVE-2026-10513— Webmention <= 5.8.0 - Unauthenticated Stored Cross-Site Scripting via MF2 'photo'/'url' Author Properties
Possible ATT&CK Techniques 2AI
T1059 · Command and Scripting Interpreter T1189 · Drive-by CompromiseAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| pfefferle | Webmention | ≤ 5.8.0 | affected |
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I. Basic Information for CVE-2026-10513
Vulnerability Information
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Vulnerability Title
Webmention <= 5.8.0 - Unauthenticated Stored Cross-Site Scripting via MF2 'photo'/'url' Author Properties
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Matthias Pfefferle Webmention 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Matthias Pfefferle Webmention是德国Matthias Pfefferle个人开发者的一款服务器端组件。 Matthias Pfefferle Webmention 5.8.0及之前版本存在跨站脚本漏洞，该漏洞源于对用户提供的MF2作者属性输入清理和输出转义不足，使得未经身份验证的攻击者能够通过parser-derived的'avatar'和'url'作者元数据注入任意Web脚本，当特权用户打开受影响的评论编辑页面时执行，容易受到存储型跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| pfefferle | Webmention | 0 ~ 5.8.0 | - |
II. Public POCs for CVE-2026-10513
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-10513 (3)
IV. Related Vulnerabilities
Same weakness: CWE-79
- CVE-2026-75838
DOMPurify before 3.4.13 Cross-Site Scripting via IN_PLACE ho - CVE-2026-75834
Grav before 2.0.14 Stored XSS via Invalid UTF-8 Byte - CVE-2026-75831
Grav before 2.0.15 Stored XSS via audio/video source URL - CVE-2026-75828
Grav before 2.0.15 Stored XSS via detectXss() Quote Bypass - CVE-2026-75107
Grav Form Plugin before 9.1.19 Stored XSS via Field Properti
V. Comments for CVE-2026-10513
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