Webmention: Server-side request forgery
Webmention is affected by server-side request forgery. Exploitation requires at least subscriber-level access. The vulnerable server can be induced to make attacker-selected network requests. The published affected range is <= 5.6.2.
- Component
- Webmention
- Plugin slug
webmention- Affected
- <= 5.6.2
- Safe version
> 5.6.2- Published
- Apr 02, 2026
This CVE was published Apr 02, 2026 and is one of 3 known issues for this plugin.
Update, patch or deactivate.
Update Webmention to a release after 5.6.2, or disable and remove it until a fixed version is available.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
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.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N