---
cve: "CVE-2026-45551"
severity: "MEDIUM"
cvss: 5.1
epss: "23%"
vendor: "Intermesh"
kev: false
exploited: false
published: "2026-05-29 13:16:22"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-14T17:45:41+02:00"
---

# CVE-2026-45551

> 5.1 MEDIUM · 🧪 PoC

## Beschreibung

Group-Office is an enterprise customer relationship management and groupware tool. Prior to 26.0.25, 25.0.100, and 6.8.165, GroupOffice allows authenticated users to persist arbitrary legacy settings for any user_id via index.php?r=core/saveSetting. A separate client-side sink in the email module injects the email_font_size setting directly into JavaScript without escaping. By combining these two issues, any low-privileged authenticated user can overwrite an administrator's email_font_size setting with a JavaScript payload and trigger stored XSS in the administrator's browser when the GroupOffice web client loads views/Extjs3/modulescripts.php. This vulnerability is fixed in 26.0.25, 25.0.100, and 6.8.165.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |

## Patch verfügbar (OSV)

- a96e2bc3524c79fa595b59e3d0a819940a833a59 (Commit)
- 01515845fe2807c2394ef5f89fd2df2e61a68443 (Commit)

## Referenzen

- <https://github.com/Intermesh/groupoffice/security/advisories/GHSA-9w92-p32g-g99p>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-45551) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_