CVE-2026-111674 in Tbed
Summary
by MITRE • 10/16/2026
Tbed through 20240319 contains a missing authorization vulnerability that allows any authenticated user to rename other users' images through the /admin/setImgFileName endpoint. Attackers can supply a victim's imgname, exposed in public image URLs and album listings, to overwrite display names with attacker-chosen text attributed to the victim.
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Analysis
by VulDB Data Team • 10/16/2026
The identified vulnerability represents a critical failure in access control mechanisms within the Tbed software platform through version 20240319. This flaw is classified as an Insecure Direct Object Reference (IDOR), which corresponds to CWE-639, allowing authenticated users to manipulate resources belonging to other users without proper authorization checks. The specific point of exploitation is the /admin/setImgFileName endpoint, a function that should be restricted to administrative privileges or strictly bound to the resource owner's identity. Instead, the system fails to validate whether the requesting user has permission to modify the image file name associated with another account. This architectural oversight enables any logged-in individual to interact with this administrative-level functionality by simply providing the target victim's imgname parameter in their request payload.
The operational impact of this vulnerability is primarily centered around identity manipulation and potential reputational damage rather than direct data exfiltration or system compromise. Because image URLs and album listings are publicly accessible, attackers can easily harvest the necessary identifiers to target specific victims. By overwriting a victim's display name with attacker-chosen text, an adversary can create misleading or defamatory content that is attributed to the innocent user within the platform's interface. This capability undermines the integrity of user identities and trust in the system, as other users interacting with the compromised account will see false information linked to their profile. In social networking contexts, such manipulation can facilitate phishing campaigns, harassment, or brand impersonation by making it appear that a legitimate user has posted offensive material or engaged in fraudulent activities under their own name.
From a threat modeling perspective, this vulnerability aligns with MITRE ATT&CK technique T1078, specifically the Valid Accounts sub-technique, where attackers leverage existing credentials to perform unauthorized actions. The lack of server-side validation for ownership rights exemplifies a common pitfall in web application development where client-supplied identifiers are trusted implicitly. To mitigate this issue, developers must implement strict authorization checks on all endpoints that modify user-specific resources. This involves verifying that the authenticated session's identity matches the owner of the resource being modified before processing any write operations. Additionally, implementing role-based access control (RBAC) to restrict administrative functions like image renaming exclusively to users with explicit admin privileges would prevent lower-privilege accounts from accessing these endpoints entirely. Regular security audits and input validation protocols should be enforced to ensure that all object references are properly validated against the current user's permissions before execution.