What’s Vulnerable › Vulnerabilities

CVE-2026-4945: Otter Blocks <= 3.1.7 - Missing Authorization to Unauthenticated Purchase Verification Bypass

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-07 · updated 2026-09-08
• Weakness: CWE-639

Description

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: through 3.1.7

References

• https://plugins.trac.wordpress.org/browser/otter-blocks/trunk/inc/plugins/class-stripe-api.php#L234
• https://plugins.trac.wordpress.org/browser/otter-blocks/trunk/inc/plugins/class-stripe-api.php#L304
• https://plugins.trac.wordpress.org/browser/otter-blocks/trunk/inc/render/class-stripe-checkout-block.php#L69
• https://plugins.trac.wordpress.org/changeset/3496611/
• https://www.wordfence.com/threat-intel/vulnerabilities/id/7ecb9f61-68d5-4c70-8d7d-e4fb067fcff9?source=cve

Get alerted when CVE-2026-4945 or the next vulnerability affects your stack