CVE-2026-94534 in lamp-cloud
Summary
by MITRE • 09/22/2026
lamp-cloud through 5.10.0 fails to validate user identity in PUT /anyone/baseInfo and PUT /anyone/avatar endpoints, allowing authenticated attackers to modify arbitrary user profiles. Attackers can supply target user IDs in request bodies to rewrite profile fields including nickname, ID card, sex, nation, education, work description, and avatar attachments of other users.
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Analysis
by VulDB Data Team • 09/22/2026
The vulnerability identified in lamp-cloud versions up to 5.10.0 represents a critical failure in server-side access control mechanisms, specifically classified under CWE-284 Improper Access Control. This flaw manifests within the PUT /anyone/baseInfo and PUT /anyone/avatar endpoints, which are designed to update user profile information such as nicknames, identification cards, gender, nationality, education level, work descriptions, and avatar attachments. The core technical deficiency lies in the application's failure to validate whether the authenticated user initiating the request is authorized to modify the specific target user account identified within the request payload. Instead of relying on session-based identity verification or server-side ownership checks, the system blindly trusts the user ID provided by the client side, allowing an attacker to manipulate arbitrary fields for any other registered user in the database.
From a technical perspective, this is a classic case of Insecure Direct Object Reference (IDOR), which aligns with CWE-639. The application logic assumes that because a request originates from an authenticated session, it should be permitted to perform write operations on resources associated with any identifier present in the HTTP body. This architectural oversight bypasses essential authorization checks where the server must verify that the resource owner matches the principal making the request. By supplying arbitrary target user IDs within the JSON or form data of PUT requests, a malicious actor can overwrite sensitive personal information belonging to other users without needing their credentials or session tokens for those specific accounts.
The operational impact of this vulnerability is severe and multifaceted. Beyond the immediate risk of privacy violation through unauthorized modification of personally identifiable information such as ID card numbers and educational backgrounds, attackers can exploit these endpoints for account takeover scenarios. For instance, by changing a victim's email address or phone number associated with their profile, an attacker could facilitate password reset attacks that rely on those contact methods. Furthermore, the ability to modify avatar attachments introduces potential risks related to content injection or reputation damage if malicious images are uploaded under another user's identity. This lack of granular permission enforcement undermines the integrity and confidentiality guarantees expected in multi-tenant SaaS environments or social platforms built upon this framework.
To mitigate this vulnerability, developers must implement strict server-side authorization checks on all state-changing endpoints that accept resource identifiers from client inputs. The application logic should explicitly verify that the authenticated user's session ID matches the owner of the target profile before processing any update requests. Additionally, implementing role-based access control (RBAC) can ensure that users only have permissions to modify their own data unless they hold a specific administrative role with elevated privileges. Input validation alone is insufficient; the primary defense must be robust identity verification at the business logic layer. Upgrading to patched versions of lamp-cloud where this issue has been resolved, or applying custom patches that enforce these ownership checks, is essential for restoring security posture. Regular penetration testing focusing on broken object level authorization patterns can help identify similar flaws in other endpoints before they are exploited in production environments.