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CVE-2026-42451— Grimmory: Stored XSS via Malicious EPUB Enables Session Token Theft

CVSS 6.3 · Medium EPSS 0.01% · P1
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I. Basic Information for CVE-2026-42451

Vulnerability Information
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Vulnerability Title
Grimmory: Stored XSS via Malicious EPUB Enables Session Token Theft
Source: NVD (National Vulnerability Database)
Vulnerability Description
Grimmory is a self-hosted digital library. Prior to version 2.3.1, a stored cross-site scripting (XSS) vulnerability in Grimmory's browser-based EPUB reader allows an attacker to embed arbitrary JavaScript in a crafted EPUB file. When a victim opens the book, the script executes in their browser with full access to the Grimmory application's session context. This can enable session token theft and account takeover, including administrative access if an administrator opens the affected book. This issue has been patched in version 2.3.1.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Grimmory 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grimmory是Grimmory开源的一个电子书管理软件。 Grimmory 2.3.1之前版本存在跨站脚本漏洞，该漏洞源于浏览器EPUB阅读器，可能导致攻击者在特制EPUB文件中嵌入任意JavaScript，当受害者打开书籍时脚本执行并获取会话上下文。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
grimmory-toolsgrimmory < 2.3.1 -

II. Public POCs for CVE-2026-42451

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III. Intelligence Information for CVE-2026-42451

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IV. Related Vulnerabilities

Same weakness: CWE-79

V. Comments for CVE-2026-42451

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