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TI-2026-63214 Aliases CVE-2026-93955GHSA-frhf-rqp4-m3jc

grimmory-tools grimmory Download Endpoint KoboController.java streamFileToResponse authorization

Priority MEDIUM 57CWE-285Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
Low · None · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-285.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00414 35th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
grimmory-toolsgrimmory3.3.0; 3.3.1; 3.3.2; 3.3.3; 3.4.0; 3.4.1—No fix listedCNA
  • grimmory Vendorgrimmory-tools Affected 3.3.0; 3.3.1; 3.3.2; 3.3.3; 3.4.0; 3.4.1 Fixed in — No fix listed CNA

CPE names CNA · 1

CPEVersionsRoleVendor
cpe:2.3:a:grimmory-tools:grimmory:*:*:*:*:*:*:*:*———
  • cpe:2.3:a:grimmory-tools:grimmory:*:*:*:*:*:*:*:* Versions — — ·—

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-93955
  2. 2026-10-03 Alias added: GHSA-frhf-rqp4-m3jc

References

Exploit 1

Other 2

  • TI-2026-63213 Improper authorization in grimmory-tools grimmory CVSS 4.0MEDIUM 5.3
  • TI-2026-30740 Grimmory: Stored XSS via Malicious EPUB Enables Session Token Theft CVSS 3.1MEDIUM 6.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences