CVE-2026-73249
Description
A flaw was found in the calibre Content Server. This vulnerability allows a remote attacker, including unauthenticated users, to bypass authorization checks when interacting with the /book-update-annotations endpoint. By sending specially crafted JSON data, an attacker can modify book annotations without proper authentication or authorization. This could lead to unauthorized changes to the e-book metadata.
Statement
Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.
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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