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CVE-2026-93955— grimmory-tools grimmory Download Endpoint KoboController.java streamFileToResponse authorization

Quick assessment

Affected
grimmory-tools grimmory
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 grimmory-tools grimmory 3.3.3/3.4.1 及之前版本中检测到一个安全漏洞。受影响的组件为“下载端点”（Download Endpoint），具体漏洞位于 文件中的 函数。通过对 参数进行恶意操纵，攻击者可绕过授权机制。该攻击可远程发起，且漏洞利用代码已公开，存在被实际利用的风险。 此外，相关 Issue #2431 已标记为“已完成”状态关闭，但其唯一一条评论仅指出该问题“已在其他渠道报告”。该 Issue 中未提供对应的修复提交（commit）或合并请求（pull request

CVSS 4.3 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-93955

Vulnerability Information
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Vulnerability Title
grimmory-tools grimmory Download Endpoint KoboController.java streamFileToResponse authorization
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
grimmory-tools grimmory 3.3.0 cpe:2.3:a:grimmory-tools:grimmory:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-93955

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-93955

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Vendor Advisories for CVE-2026-93955 (1)

Other References for CVE-2026-93955 (2)

IV. Related Vulnerabilities

Same product: grimmory
Same vendor: grimmory-tools
Same weakness: CWE-639

V. Comments for CVE-2026-93955

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