CVE-2026-103269 in Ghost
Summary
by MITRE • 10/01/2026
Ghost versions 5.3.0 before 6.62.0 contain a missing authorization vulnerability that allows an authenticated site member to read the excerpts of posts they do not have access to (gated content).
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Analysis
by VulDB Data Team • 10/01/2026
The Ghost platform, specifically in versions ranging from 5.3.0 up to but excluding 6.62.0, is affected by a critical missing authorization vulnerability that undermines the integrity of its membership and gating mechanisms. This flaw allows authenticated site members to access content that has been explicitly restricted or gated behind paywalls or subscription tiers they have not purchased or joined. The core issue lies in the application's failure to properly validate user permissions against resource ownership when serving post excerpts, which are typically used as previews for blog posts on listing pages and search results.
From a technical perspective, this vulnerability represents a classic case of Broken Access Control where the server-side logic does not enforce sufficient checks before returning data to the client. When an authenticated user requests a list of posts or searches for content, the API endpoint responsible for generating these excerpts fails to verify whether the requesting user has the appropriate membership level or subscription status required to view that specific piece of gated content. Consequently, the system returns the excerpt text even when the full post is restricted, effectively bypassing the intended access control measures designed by site administrators to monetize their content or restrict it to a private audience.
The operational impact of this vulnerability is significant for organizations and individuals relying on Ghost as a membership platform. By exposing excerpts of gated posts, attackers can gain unauthorized insight into proprietary information, premium articles, or confidential communications that were intended to be hidden from the general public. This not only violates user privacy expectations but also directly impacts revenue models based on subscriptions, as users may extract valuable content without paying for full access. Furthermore, it erodes trust in the platform's security posture and can lead to data leakage if sensitive information is inadvertently included in these excerpts.
This vulnerability aligns with CWE-284, which describes Improper Access Control, specifically highlighting failures in authorization checks that allow users to perform actions or view resources beyond their assigned privileges. In terms of offensive cybersecurity frameworks, this behavior corresponds to the ATT&CK technique T1078, Valid Accounts, where an attacker leverages legitimate credentials to access restricted data due to flawed application logic rather than credential theft. The exploitation does not require complex payloads but relies on simple HTTP requests that trigger the vulnerable endpoint with valid authentication tokens associated with lower-tier or free accounts.
To mitigate this risk, administrators of Ghost instances within the affected version range must upgrade immediately to version 6.62.0 or later, where these authorization checks have been corrected. Until an update is applied, site owners should consider implementing additional web application firewall rules that monitor for anomalous access patterns to post excerpt endpoints and restrict them based on membership status if possible. Regular security audits of custom integrations and API usage are also recommended to ensure no other endpoints suffer from similar logic flaws. Maintaining up-to-date software versions remains the most effective defense against such authorization bypass vulnerabilities in modern web applications.