CVE-2026-93955

grimmory-tools grimmory Download Endpoint KoboController.java streamFileToResponse authorization

LOW 2.1EPSS 0.4%

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.

Affected: grimmory-tools · grimmory
CVSS v4.0 VULDB: 2.1 LOWCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 VULDB: 4.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CVSS v2.0 VULDB: 4.0 MEDIUMAV:N/AC:L/Au:S/C:P/I:N/A:N
EPSS: 0.41% chance of exploitation in the next 30 days, 34th percentile
Published: 2026-09-19
Updated: 2026-09-21

Proof-of-concept exploits (1)

grimmory-tools/grimmory/issues/24314523★ · 2026-10-13

CVE-2026-93955

Proof-of-concept exploits (1)

References

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