Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE: A security weakness
Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE is affected by a security weakness. The vulnerable path is reachable without authentication. The resulting impact depends on how the affected component exposes the vulnerable operation. The published affected range is <= 3.1.4.
- Component
- Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE
- Plugin slug
otter-blocks- Affected
- <= 3.1.4
- Safe version
> 3.1.4- Published
- Apr 30, 2026
- Weakness
- CWE-285 — Improper Authorization
This CVE was published Apr 30, 2026 and is one of 13 known issues for this plugin.
Update, patch or deactivate.
Update Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE to a release after 3.1.4, 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 Otter Blocks plugin for WordPress is vulnerable to Purchase Verification Bypass in all versions up to, and including, 3.1.4. This is due to the 'get_customer_data' method relying on an unsigned 'o_stripe_data' cookie to determine Stripe product ownership for unauthenticated users. The 'check_purchase' method trusts this cookie data without performing server-side verification against the Stripe API for one-time 'payment' mode purchases. This makes it possible for unauthenticated attackers to bypass Stripe purchase-gated content visibility conditions by forging the 'o_stripe_data' cookie with a target product ID, which is publicly exposed in the checkout block's HTML source.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N