Purchase Verification Bypass in Otter Blocks Plugin for WordPress
CVE-2026-2892

7.5HIGH

Key Information:

Vendor

WordPress
Status
Otter Blocks – Gutenberg Blocks, Page Builder For Gutenberg Editor & Fse
Vendor
CVE Published:
30 April 2026

What is CVE-2026-2892?

The Otter Blocks plugin for WordPress is susceptible to a Purchase Verification Bypass vulnerability found in all versions up to and including 3.1.4. The vulnerability arises from the 'get_customer_data' method's reliance on an unsigned 'o_stripe_data' cookie for verifying Stripe product ownership for unauthenticated users. The 'check_purchase' method trusts this cookie data, neglecting to perform necessary server-side validation against the Stripe API, particularly in one-time 'payment' mode transactions. This oversight allows unauthenticated attackers to circumvent Stripe's purchase-gated content restrictions by manipulating the 'o_stripe_data' cookie to contain a target product ID, which is accessible in the checkout block's HTML.

Affected Version(s)

Otter Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE 0 <= 3.1.4

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/otter-blocks/t...
https://plugins.trac.wordpress.org/browser/otter-blocks/t...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Drew Webber
.