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CVE-2026-93955

grimmory-tools grimmory Download Endpoint KoboController.java streamFileToResponse authorization

CVSS 4.0 5.3 MEDIUMCVSS 3.1 4.3 MEDIUMCVSS 3.0 4.3 MEDIUMCVSS 2.0 4.0 Check source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-93955

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-93955

Published

grimmory

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "grimmory-tools",
                    "product": "grimmory",
                    "versions": [
                        {
                            "version": "3.3.0",
                            "status": "affected"
                        },
                        {
                            "version": "3.3.1",
                            "status": "affected"
                        },
                        {
                            "version": "3.3.2",
                            "status": "affected"
                        },
                        {
                            "version": "3.3.3",
                            "status": "affected"
                        },
                        {
                            "version": "3.4.0",
                            "status": "affected"
                        },
                        {
                            "version": "3.4.1",
                            "status": "affected"
                        }
                    ],
                    "cpes": [
                        "cpe:2.3:a:grimmory-tools:grimmory:*:*:*:*:*:*:*:*"
                    ],
                    "modules": [
                        "Download Endpoint"
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON