CVE-2026-111649 in paopao-ce
Summary
by MITRE • 10/16/2026
Rocboss paopao-ce through 0.6.0-alpha.3 contains an insecure direct object reference vulnerability in DownloadAttachment that allows authenticated users to access private media by supplying arbitrary content IDs. Attackers can enumerate sequential post_content ids via the /v1/attachment endpoint to obtain signed download URLs for other users' private, friend-only and following-only images, videos and attachments.
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Analysis
by VulDB Data Team • 10/17/2026
The vulnerability identified in Rocboss paopao-ce versions through 0.6.0-alpha.3 represents a critical failure in access control mechanisms within the application's media handling subsystem. Specifically, this is an insecure direct object reference (IDOR) flaw located in the DownloadAttachment functionality. In secure software design, when a user requests to download or view a file, the system must verify that the requesting user has explicit permission to access the specific resource identified by its unique identifier. However, in this implementation, the application relies on predictable and sequential post_content identifiers without implementing adequate authorization checks at the point of URL generation or retrieval. This architectural oversight allows any authenticated user to bypass intended privacy restrictions simply by manipulating the input parameters sent to the /v1/attachment endpoint.
The technical mechanism of exploitation involves the enumeration of these sequential content IDs. Because the identifiers are generated in a predictable, linear fashion rather than using random or cryptographically secure unique identifiers, an attacker can systematically iterate through integer values to discover valid attachment references belonging to other users. Once a valid ID is identified, the application generates and returns a signed download URL for that specific media file. These URLs often possess temporary validity periods designed to facilitate legitimate downloads while preventing unauthorized hotlinking from external sites. However, because the signature validation does not cross-reference the identity of the authenticated user making the request with the ownership metadata of the target resource, the signed URL remains valid regardless of who possesses it or how they obtained it. This effectively neutralizes the protective value of the signing mechanism in this specific context.
The operational impact of this vulnerability is significant for users relying on the platform to host private content. Attackers can systematically harvest media files that are intended to be visible only to the owner, their friends, or a select group of followers. The scope of affected data includes images, videos, and various file attachments stored within the application's ecosystem. This leads to a severe breach of confidentiality for end-users who expect their private communications and personal media to remain isolated from public view or unauthorized third-party access. For organizations using this software, it constitutes a direct violation of data privacy principles and can lead to regulatory non-compliance depending on the nature of the exposed data and applicable jurisdictional laws such as GDPR or CCPA.
From a classification perspective, this vulnerability aligns with CWE-639, which describes Injection of Direct Object References, specifically where access control is not enforced for direct object references. It also maps to MITRE ATT&CK technique T1078, Valid Accounts, as the exploitation requires initial authentication but leverages those credentials to escalate privileges in terms of data visibility beyond what was intended by the application logic. The lack of proper authorization checks places this squarely within the category of broken access control vulnerabilities, which remain one of the most prevalent and dangerous classes of web application security risks according to OWASP Top 10 standards.
To mitigate this vulnerability, developers must implement strict object-level authorization checks before generating or serving signed URLs. Every request for a media resource should validate that the authenticated user associated with the session token is explicitly permitted to access the specific content ID requested. This can be achieved by querying the database to verify ownership or permission relationships prior to signing the URL. Additionally, replacing sequential integer identifiers with UUIDs or other non-sequential unique identifiers would significantly increase the difficulty of enumeration attacks, although it does not replace the need for proper authorization logic. Implementing rate limiting on the attachment endpoint may also help mitigate automated scanning efforts while more permanent fixes are deployed. Regular security audits and static code analysis focused on access control patterns are recommended to prevent similar flaws in future releases.