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Vulnerabilities CVE-2026-42451

CVE-2026-42451

Medium
Open
TLP:CLEAR

Grimmory: Stored XSS via Malicious EPUB Enables Session Token Theft

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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.

Details

CVSS Score
6.3
EPSS Score
0.14%

3.5th percentile

CVSS Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:L
Confidence
90%
Published
May 8, 2026
Last Modified
May 8, 2026
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