7.2
HighCVSS 3.1 · from Wordfence
CVE-2026-10513
Webmention <= 5.8.0 - Unauthenticated Stored Cross-Site Scripting via MF2 'photo'/'url' Author Properties
Webmention · Cross-site scripting · CWE-79AffectedWebmention
FixNo fix listed yet.
PublishedJun 30, 18:32 · Wordfence
ScoredJun 30 · 7.2 · Wordfence
Exploit code publicNone known · checked 21:18 UTC
ExploitedNone known · CISA KEV checked 22:06 UTC
What we know
No known exploitation. CISA KEV, checked 22:06 UTC.
No public exploit code known. Exploit-DB, Metasploit, Nuclei, checked 21:18 UTC.
An attacker only needs network access to the target. No login needed. CVSS: network, no privileges.
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.
From Wordfence
Affected and fixed versions
ProductAffectedFixed inWebmentionup to 5.8.0–
Exploit code
Exploit-DBnone knownMetasploitnone knownNucleinone known