CVE-2026-93955
grimmory-tools grimmory Download Endpoint KoboController.java streamFileToResponse authorization
- State
- Published
- Severity
- 5.3 Medium
- Published
- Sep 19, 2026
- Updated
- Sep 21, 2026
- Reserved
- Sep 19, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P | VulDB |
| 3.1 | 4.3 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:P/RL:X/RC:R | VulDB |
| 3.0 | 4.3 Medium | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:P/RL:X/RC:R | VulDB |
| 2.0 | 4.0 Medium | AV:N/AC:L/Au:S/C:P/I:N/A:N/E:POC/RL:ND/RC:C | VulDB |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
grimmorygrimmory-tools |
|
References
- VDB-407914 | grimmory-tools grimmory Download Endpoint KoboController.java streamFileToResponse authorizationvdb-entrytechnical-description
- VDB-407914 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
- CVE-2026-93955 | CVE Analysis and Reportthird-party-advisory
- Submit #943921 | grimmory-tools grimmory 3.3.3 Incorrect Access Controlthird-party-advisory
- https://github.com/grimmory-tools/grimmory/issues/2431exploitissue-tracking
- https://github.com/grimmory-tools/grimmory/issues/2431#issuecomment-5384402858issue-tracking
- https://github.com/grimmory-tools/grimmory/product
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