---
cve: "CVE-2026-42451"
severity: "MEDIUM"
cvss: 6.3
epss: "0.1%"
vendor: "grimmory-tools"
kev: false
exploited: false
published: "2026-05-08 23:16:38"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T11:41:54+02:00"
---

# CVE-2026-42451

> 6.3 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Hoch | good |
| PR Privilegien | Gering | warn |
| UI Interaktion | Erforderlich | good |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Gering | warn |

## Patch verfügbar (OSV)

- d0ba4aec9c6b19d6cf2f60ff7078abd8c1787ea0 (Commit)

## Referenzen

- <https://github.com/grimmory-tools/grimmory/security/advisories/GHSA-frv6-5wq5-9p24>
- <http://github.com/grimmory-tools/grimmory/releases/tag/v2.3.1>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-42451) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_