CVE-2026-1857 Server-side request forgery in Kadence Blocks — Page Builder Toolkit for Gutenberg Editor
Authenticated contributors can exploit SSRF to retrieve sensitive GetResponse data and leak API keys via insufficient endpoint validation.
- 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-2026-1857?
CVE-2026-1857 is a medium-severity server-side request forgery vulnerability in stellarwp Kadence Blocks — Page Builder Toolkit for Gutenberg Editor, published on 18 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Gutenberg Blocks with AI by Kadence WP plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 3.6.1. This is due to insufficient validation of the `endpoint` parameter in the `get_items()` function of the GetResponse REST API handler. The endpoint's permission check only requires `edit_posts` capability (Contributor role) rather than `manage_options` (Administrator). This makes it possible for authenticated attackers, with Contributor-level access and above, to make server-side requests to arbitrary endpoints on the configured GetResponse API server, retrieving sensitive data such as contacts, campaigns, and mailing lists using the site's stored API credentials. The stored API key is also leaked in the request headers.
Weakness: CWE-918
Which versions are affected by CVE-2026-1857?
How do I fix CVE-2026-1857?
No fix has been published for CVE-2026-1857 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-2026-1857 being exploited?
There is no known exploitation of CVE-2026-1857 in the wild and no public exploit code.
Sources
Also known as GHSA-8425-76gw-qxj4.