A vulnerability was detected in grimmory-tools grimmory up to 3.3.3/3.4.1. Affected by this vulnerability is the function streamFileToResponse of the file backend/src/main/java/org/booklore/controller/KoboController.java of the component Download Endpoint. Performing a manipulation of the argument bookId results in authorization bypass.
The attack may be initiated remotely. The exploit is now public and may be used. Issue #2431 is closed as completed, but its only comment states that the issue “has already been reported elsewhere.” No fixing commit or pull request is identified there.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products
grimmory-tools:grimmory
References 7
https://vuldb.com/vuln/407914
VDB-407914 | grimmory-tools grimmory Download Endpoint KoboController.java streamFileToResponse authorization
https://vuldb.com/vuln/407914/cti
VDB-407914 | CTI Indicators (IOB, IOC, IOA)
https://vuldb.com/cve/CVE-2026-93955
CVE-2026-93955 | CVE Analysis and Report
https://vuldb.com/submit/943921
Submit #943921 | grimmory-tools grimmory 3.3.3 Incorrect Access Control
https://github.com/grimmory-tools/grimmory/issues/2431
NVD
https://github.com/grimmory-tools/grimmory/issues/2431#issuecomment-5384402858
NVD
https://github.com/grimmory-tools/grimmory/
NVD