CVE-2026-109934 in Otter Blocks Plugin
Summary
by MITRE • 10/23/2026
The Otter Blocks WordPress plugin before 3.2.8 does not correctly determine whether a post is publicly readable before returning its data through a REST API endpoint, treating any post with the published status as public, allowing unauthenticated users to read manual excerpts of password-protected posts, the content and titles of non-public post types, and, on WooCommerce sites, coupon codes and their descriptions.
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Analysis
by VulDB Data Team • 10/23/2026
The vulnerability identified in Otter Blocks versions prior to 3.2.8 represents a significant flaw in access control logic within the WordPress REST API implementation. The core issue stems from an incorrect determination of public readability for posts. Specifically, the plugin erroneously treats any post with a published status as publicly accessible, failing to account for other critical security attributes such as password protection or specific visibility settings that restrict user access. This logical error allows unauthenticated users to bypass intended restrictions and retrieve sensitive data through standard API endpoints designed for legitimate content delivery.
From a technical perspective, the flaw lies in the validation mechanism used by the plugin when processing REST API requests. Instead of performing a comprehensive check against WordPress core functions like post_password_required or checking specific capability requirements, the code relies solely on the post_status field being set to publish. This oversimplification ignores the nuanced permission models established by WordPress for different content types and security states. Consequently, any request made without authentication can successfully query these endpoints if the target post is marked as published, regardless of whether it requires a password or belongs to a restricted post type.
The operational impact of this vulnerability is substantial, particularly in environments where sensitive information is managed through WordPress posts. Unauthenticated attackers can exploit this flaw to extract manual excerpts from posts that are supposed to be protected by passwords. Furthermore, the vulnerability extends beyond standard blog posts; it affects non-public post types as well, allowing access to their content and titles which may contain proprietary or internal business data. In e-commerce setups utilizing WooCommerce, the impact is even more severe, as coupon codes and their descriptions become accessible to anyone with internet connectivity. This exposure can lead to unauthorized use of discounts, financial loss for merchants, and a breach of customer trust due to the leakage of promotional strategies.
This vulnerability aligns closely with CWE-284 Improper Access Control, specifically reflecting failures in enforcing restrictions on access to data based on user roles or authentication status. It also maps to MITRE ATT&CK technique T1078 Valid Accounts when considering how attackers might leverage valid but unauthenticated sessions to harvest information, although the primary vector here is unauthorized API consumption rather than account compromise. The exposure of coupon codes falls under CWE-200 Information Exposure, as it reveals security-relevant data that should be restricted to authenticated or authorized users only.
To mitigate this risk, site administrators must immediately update the Otter Blocks plugin to version 3.2.8 or later, where the access control logic has been corrected to properly evaluate password protection and visibility settings before returning data via REST endpoints. For sites unable to patch immediately due to compatibility concerns, implementing a Web Application Firewall rule that restricts access to specific REST API paths associated with Otter Blocks can provide temporary relief. Additionally, reviewing WordPress capabilities and ensuring that custom post types have appropriate capability mappings is recommended as part of a broader security hardening strategy. Regular auditing of plugin code for similar logic errors in other plugins is also advised to prevent recurrence of such information disclosure vulnerabilities.