CVE-2026-77385
Description
A flaw was found in Kyoo, a self-hosted media server. A registered user with specific permissions could exploit a missing authorization check in the transcoder by supplying a specially crafted filesystem path. This vulnerability allows the user to retrieve uncataloged files, such as hidden or temporary files, from the media directory, leading to information disclosure.
Statement
This vulnerability is rated as Moderate severity because unauthorized file exposure requires an authenticated user with playback permissions and is limited to files located within the configured media directory. Additionally, Kyoo is not packaged, shipped, or supported in Red Hat products, resulting in no direct impact on supported enterprise environments.
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism
Access control checks for specific user data or functionality can be bypassed.
Access Control
Technical Impact: Gain Privileges or Assume Identity
Horizontal escalation of privilege is possible (one user can view/modify information of another user).
Access Control
Technical Impact: Gain Privileges or Assume Identity
Vertical escalation of privilege is possible if the user-controlled key is actually a flag that indicates administrator status, allowing the attacker to gain administrative access.
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