grimmory-tools grimmory Download Endpoint KoboController.java streamFileToResponse authorization (CVE-2026-93955) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-93955

grimmory-tools grimmory Download Endpoint KoboController.java streamFileToResponse authorization

Answer in brief

CVE-2026-93955 records a Unknown severity vulnerability in grimmory-tools grimmory Download Endpoint KoboController.java streamFileToResponse authorization. The current sources do not mark it as known exploited. The current feed maps grimmory-tools/grimmory (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 19, 2026Updated Sep 19, 2026Source checked Sep 19, 2026First seen by HOL Sep 19, 2026Material review Sep 19, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps grimmory-tools/grimmory (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
grimmory-tools/grimmorygeneric	3.3.0 \|\| 3.3.1 \|\| 3.3.2 \|\| 3.3.3 \|\| 3.4.0 \|\| 3.4.1	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for grimmory-tools/grimmory.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 19, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.