Authorization bypass through user-controlled key in Kavita - #VU147285
Published: September 7, 2026
Vulnerability identifier: #VU147285
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose other users' bookmarked page images.
The vulnerability exists due to authorization bypass through user-controlled key in the /api/download/bookmarks endpoint when processing user-supplied bookmark and series identifiers. A remote user can submit another user's bookmark identifier paired with a series identifier they can access to disclose other users' bookmarked page images.
Bookmark identifiers are sequential auto-incrementing integers, enabling their enumeration.
Affected software
Kavita
Remediation
Install security update from vendor's website.
Kavita - update to 0.9.1.0