CVE-2026-0688 Webmention <= 5.6.2 - Authenticated (Subscriber+) Server-Side Request Forgery
Authenticated attackers can exploit a Server-Side Request Forgery vulnerability in the Webmention plugin to query and modify internal services.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-0688?
CVE-2026-0688 is a medium-severity server-side request forgery vulnerability in pfefferle Webmention, published on 2 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-0688?
How do I fix CVE-2026-0688?
No fix has been published for CVE-2026-0688 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-0688 being exploited?
There is no known exploitation of CVE-2026-0688 in the wild and no public exploit code.
Sources
Also known as GHSA-wjf6-53j2-2f8c.