CVE-2026-110762 in bbPress
Summary
by MITRE • 10/14/2026
bbPress before 2.6.19 contains an information disclosure vulnerability that allows unauthenticated visitors to view restricted subforum posts because hide_sitewide ignores ancestor forum visibility. Topics and replies in public subforums nested under private or hidden parents expose title, permalink and body via the BuddyPress activity stream and REST endpoint.
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Analysis
by VulDB Data Team • 10/14/2026
The bbPress plugin prior to version 2.6.19 contains a critical information disclosure vulnerability rooted in flawed access control logic within its forum hierarchy handling mechanisms. Specifically, the function responsible for determining whether a site-wide forum should be hidden fails to properly validate visibility settings of ancestor forums when processing subforums. This logical error creates a bypass condition where the security model assumes that if a specific subforum is marked as public or visible, it remains accessible regardless of its parent container's privacy status. In standard hierarchical permission models, child entities typically inherit restrictive permissions from their parents unless explicitly overridden with higher privileges; however, in this implementation, the visibility check for ancestor forums is effectively ignored during the rendering and API response generation processes.
This technical flaw allows unauthenticated visitors to access content that should be strictly restricted to authorized users or specific community members. When a private or hidden parent forum contains public subforums, topics and replies created within those subforums are incorrectly exposed through multiple attack vectors. The vulnerability manifests prominently in the BuddyPress activity stream integration as well as via the WordPress REST API endpoints associated with bbPress data retrieval. Attackers can exploit these interfaces to retrieve sensitive information including post titles, permalinks, and full message bodies without any form of authentication or authorization credentials. This represents a significant breach of confidentiality for forums intended to be private spaces for specific groups or organizations.
The operational impact of this vulnerability extends beyond simple content leakage. By exposing internal discussions through public-facing APIs and activity streams, attackers can gather intelligence on organizational structures, sensitive project details, or personal information shared within closed communities. This data can subsequently be used for targeted phishing campaigns, social engineering attacks, or further reconnaissance against the hosting infrastructure. The exposure of permalinks also aids in mapping the site structure, potentially facilitating more sophisticated attacks such as directory traversal or identifying other vulnerable endpoints. For businesses relying on bbPress for internal communication or member-only content, this flaw undermines trust and compliance with data protection regulations that require strict access controls over sensitive information.
Mitigation strategies must prioritize immediate patching to version 2.6.19 or later where the visibility logic has been corrected to properly enforce parent-child permission inheritance. Until patches are applied, administrators should consider disabling BuddyPress activity stream integration for bbPress content if feasible, as this is one of the primary vectors for exposure. Additionally, implementing web application firewall rules that monitor REST API requests for unusual patterns related to forum data retrieval can provide a temporary layer of defense against automated exploitation attempts. Regular audits of forum hierarchy configurations are also recommended to ensure no other misconfigurations exist where public subforums might inadvertently inherit incorrect visibility states from private parents.