CVE-2026-119763 in changelog.com
Summary
by MITRE • 10/30/2026
changelog.com before commit 7b35e829 contains a missing authorization vulnerability that allows unauthenticated attackers to read unpublished content via preview routes in PostController, NewsIssueController and NewsItemController. Attackers can enumerate hashid post IDs, sequential newsletter slugs and integer news IDs against preview endpoints to read draft posts, unsent newsletters and declined news items.
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Analysis
by VulDB Data Team • 10/30/2026
The vulnerability identified in changelog.com prior to commit 7b35e829 represents a critical failure in access control mechanisms within the application's content management workflow. Specifically, this is an Insecure Direct Object Reference (IDOR) combined with Broken Access Control, classified under CWE-639 and CWE-284 respectively. The core technical flaw lies in the implementation of preview endpoints for posts, newsletters, and news items. These endpoints are designed to allow authorized users, such as editors or administrators, to view content that has not yet been published to the public audience. However, the security logic governing these routes fails to verify whether the requesting user possesses the necessary permissions to access the specific resource identified by its unique identifier. Instead of enforcing strict authorization checks against the session context or user role, the application relies on the predictability and sequential nature of the identifiers used for internal content tracking.
The operational impact of this vulnerability is significant because it allows unauthenticated attackers to bypass authentication entirely while still accessing sensitive data. By exploiting the predictable generation patterns of the underlying identifier systems, an attacker can systematically enumerate resources that should remain hidden from public view. For posts and news items, the application utilizes Hashids or similar obfuscation techniques for post IDs, but these are often implemented in a way that allows for brute-force enumeration if the salt is known or if the ID space is small enough to be cracked through pattern analysis. Similarly, newsletter slugs follow sequential patterns, and news item identifiers are simple integers. This predictability enables an attacker to iterate through potential IDs using automated scripts, sending requests to the preview endpoints of PostController, NewsIssueController, and NewsItemController without providing any valid session tokens or credentials.
The consequences of this unauthorized access extend beyond mere data leakage. Attackers can read draft posts that may contain unreleased product features, strategic business plans, or internal communications intended only for a limited audience. They can also view unsent newsletters, which might reveal marketing strategies and customer segmentation details before they are deployed to subscribers. Furthermore, the ability to see declined news items exposes editorial decision-making processes and potentially sensitive information about partners or competitors that were rejected from publication. This level of exposure compromises the confidentiality integrity of the platform's content pipeline and can lead to competitive disadvantage, reputational damage, and loss of trust among users who expect their private drafts to remain secure until explicitly published.
From a threat modeling perspective aligned with MITRE ATT&CK techniques, this vulnerability facilitates Initial Access through exploitation of insufficiently secured data objects (T1078) and potentially Information Discovery via enumeration of valid identifiers (T1592). The attacker leverages the application's own logic against it by treating internal preview mechanisms as public-facing APIs. To mitigate this issue effectively, developers must implement robust authorization checks on all preview endpoints. This involves verifying that the authenticated user associated with the session has explicit permission to view the specific resource identified by its ID. Additionally, relying solely on obfuscated identifiers like Hashids is insufficient for security; these should be paired with strict access control lists (ACLs) or role-based access controls (RBAC). The fix implemented in commit 7b35e829 likely addresses this by ensuring that the preview functionality checks user permissions before rendering any content, thereby preventing unauthenticated users from accessing draft or unpublished materials regardless of whether they can guess the correct identifier.