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.
Published: 2026-05-08
Score: 6.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Tue, 12 May 2026 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Sun, 10 May 2026 21:45:00 +0000

Type Values Removed Values Added
First Time appeared Grimmory-tools
Grimmory-tools grimmory
Vendors & Products Grimmory-tools
Grimmory-tools grimmory

Fri, 08 May 2026 23:15:00 +0000

Type Values Removed Values Added
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.
Title Grimmory: Stored XSS via Malicious EPUB Enables Session Token Theft
Weaknesses CWE-79
CWE-80
References
Metrics cvssV3_1

{'score': 6.3, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:L'}


Subscriptions

Grimmory-tools Grimmory
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-12T18:31:26.652Z

Reserved: 2026-04-27T13:55:58.693Z

Link: CVE-2026-42451

cve-icon Vulnrichment

Updated: 2026-05-12T13:17:29.405Z

cve-icon NVD

Status : Deferred

Published: 2026-05-08T23:16:38.680

Modified: 2026-05-13T16:49:32.233

Link: CVE-2026-42451

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-10T21:24:40Z

Weaknesses