CVE-2026-4945: Themeisle Otter Blocks – Gutenberg Blocks, Page Builder For Gutenberg Editor & Fse

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

The Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 3.1.7 via the 'watch_checkout' function due to missing validation on a user controlled key. This makes it possible for unauthenticated attackers to pay for a lower-cost product while obtaining entitlement for a premium product by manipulating the product_id parameter independently of the price_id parameter in the Stripe checkout URL.

Affected products

• Themeisle Otter Blocks – Gutenberg Blocks, Page Builder For Gutenberg Editor & Fse: up to and including 3.1.7

Published 2026-09-07. Last modified 2026-09-08.