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6.4
CVE-2026-0688: WordPress Webmention plugin lets logged‑in users request any URL
CVE-2026-0688 · published 7 months ago
Summary
The Webmention plugin for WordPress (up to version 5.6.2) allows users who can log in, even with the lowest subscriber role, to cause the site to fetch data from any address they choose. This could let an attacker reach internal systems or gather private information. Update the plugin to the latest version or remove it if it’s not needed.
Original advisory text
Webmention <= 5.6.2 - Authenticated (Subscriber+) Server-Side Request Forgery
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 application and can be used to query and modify information from internal services.
References
- https://github.com/pfefferle/wordpress-webmention/blob/057223cee18a9e93b017d0f21... URL
- https://plugins.trac.wordpress.org/browser/webmention/tags/5.6.2/includes/class-... URL
- https://plugins.trac.wordpress.org/changeset/3494831/webmention URL
- https://www.wordfence.com/threat-intel/vulnerabilities/id/02c9beba-dfa5-4a30-835... URL
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/0xxx/CVE-2026-0688.j... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-0688 Vendor Advisory
Internet-facing
60 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit
- Gives an attacker partial control
Type
CWE-918Server-Side Request Forgery (SSRF)
Timeline
Published2 Apr 2026
Updated30 Oct 2026
First seen2 Apr 2026
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