CVE-2026-42451

MediumCVSS 6.3/10Last modified Jul 24, 2026

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.

Metrics

CVSS 3.1 6.3/10CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:L

Weakness enumeration

CWE-79 CWE-80

Affected software

No affected versions have been published.

Timeline

Published: May 8, 2026
Last modified: Jul 24, 2026
NVD status: Deferred

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